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I put this question in this forum because there doesn't seem to be a "Miscellaneous" forum here at AR.

I notice in various other threads that fairly frequently one of the factors folks view as a "knock" against cartridges which are very large capacity for their bore-size is the assertion that such cartridges lose accuracy due to throat burn-out much more quickly than smaller capacity cartridges. Weatherby artridges, for example, are often accused of that "weakness" or "failing".

Sometimes I wonder about that common assumption. To what degree is extra-large powder capacity a real potential design flaw, in a hunting rifle? I agree it could be a serious handicap in a benchrest rifle chambering or maybe even in an across-the-course highpower target gun, but in a hunting rifle? bewildered

How many of you have had a truly accurate hunting rifle chambered for a very large-for-the-bore capacity case that quickly lost accuracy due to barrel burn-out? I'm talking a gun here which started out shooting groups in the half-minute of angle vicinity, and then within a few of years of use, wouldn't?

For 50-60 years I have been buying/collecting/shooting/building various kinds of rifles. Four of the ones I have had the longest include a .300 Wby Mag (built by Roy Weatherby on a Model 70 in the late 1940's), a 7 m/m Remington Mag (1st month of production M700 BDL), a 7 m/m Weatherby Mag, and a .257 Weatherby Mag. All have been great shooters since the day I got them and still are. I have never even bothered to inspect their throats over the years because the way they shoot I don't CARE what their throats look like.

So, am still curious....have I just been lucky? What's your actual, real, personal experience(s)?
 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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First off, IMHO half-minute rifles of any sort are a lot harder to find in the real world than on the internet. I know half-minute shooters sure are!

Also, in my opinion, I prefer to say that large capacity cases aren't any less long-lived than others, but they are much easier to damage through abuse, (for example by shooting long strings at the range).


for every hour in front of the computer you should have 3 hours outside
 
Posts: 7786 | Location: Between 2 rivers, Middle USA | Registered: 19 August 2000Reply With Quote
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quote:
Originally posted by Alberta Canuck:
quote:
Originally posted by Mark:
First off, IMHO half-minute rifles of any sort are a lot harder to find in the real world than on the internet. I know half-minute shooters sure are!

Also, in my opinion, I prefer to say that large capacity cases aren't any less long-lived than others, but they are much easier to damage through abuse, (for example by shooting long strings at the range).




Yes, I'd sure agree with that first statement. I've probably owned/shot over 500 rifles in my lifetime. There was a period when I shot at least 60 rounds a day of centerfire rifle, 4 days a week.

Of course, many of the rifles I shot just enough to learn generally how they performed....that was why I bought them. I had the money & time, and I wanted to learn first hand, not just by reading. Of them all, in the hunting rifle class I probably have had less than 20 which were genuinely dependable .5 MOA rifles, with or without tuning added.

Perhaps instead of saying "in the vicinity of " I should have said ".50-to-.75 MOA or less" when asking about the forum members' experiences.

But, I am still interested in your second comment. How many rounds without cooling would you consider to be abuse? Or does that depend on the rate of fire? If so, what would you suggest as a safe rate of fire?


My country gal's just a moonshiner's daughter, but I love her still.

 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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The only barrels I have "burned out" have been 9MM's,45ACP's, 223's, and 308's.

I have not shot a 300 or any other Magnum bbl in competition.

I consider people that get to "burn out" bbls lucky, because they get to shoot alot. Big Grin


DOUBLE RIFLE SHOOTERS SOCIETY
 
Posts: 16134 | Location: Texas | Registered: 06 April 2002Reply With Quote
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fishingThe only one for me is a .257 ,Ruger varmint rifle that was bought in 1972. Only in the last couple months has it started to spread its grouping. 10,000 shots perhaps most of it sustained* shooting.

* 50 rounds or there abouts in two hrs. or less.

Nice thought provoking thread.Allan is going to think you're stealing his thunder beerroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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Well personally I burned out one barrel in .308 . I also burnt a couple of M-16's but we need not go into that !.

A shooting buddy of mine has seen accuracy fall off significantly in a Ruger .204 and a .221 fireball . I can't say how many rounds went through them as I didn't own them . I can tell you from my personal observation the .204 went away quicker that I though possible .

My friend is Anal Re tensive about bore cleanliness as well as accuracy loading . How ever he doesn't scrub , just a wet patch jag followed by dry and another wet then dry patch after shooting each of his particular group loads .

He has an Old Danish VAR barreled Garand CMP purchase that he Outer Foul Out cleaned for two days , Changed the fluid 4 times !. Took him a box of twenty rounds to foul it back .
That Dam thing will put # 15 into 3/4" at 100 Yd. all day long with the Accurate powder load he uses . I've done it myself on several occasions with his Rifle . So when do they wear out ?. AC I have no clue as to when to much is to Much or when barrels lose accuracy , to many factors for my calculations .

Shoot Straight Know Your Target . ... salute

Shoot Straight Know Your Target . ... salute
 
Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006Reply With Quote
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Hey AC, I was just wondering what percentage of Firearm Owners actually Develop the very Best Load for their Firearms. Without knowing what a Firearm is really capable of, many may never know the Throat has even moved.
-----

Had a buddy and his Nephew(Eddie) go to the Range with me one day. Eddie sat in the back of the Bronco and loaded magazines for the entire trip which was about 1 1/4 hrs.

We got to the Range and planned to be there ALL DAY, maybe 8-10hrs. Got everything to the Benches, hung Targets and back to the Benches. We were the only people at the Range and agreed the Line was Hot.

Not real sure how many 9mm and AK rounds Eddie cranked off in 15min, but I remember laughing so hard that I had no concentration at all. So I sat back and watched the dust fly at 25yds and occasionally at 100yds. May have been some further on down range, I don't remember.

Finally it got quiet.

We went down to the 25yd line and Eddie had 3 holes in his LARGE Target and he was happy as a democrat saying YES to more TAXES and saying NO to Oil Exploration.

I doubt his barrels lasted very long, but I also doubt he ever knew the Points-of-Impact got wider.
-----

It has been a very long time since I had a rebarrel. Normally trade into something else to try before one goes away. But, other than Load Development, most of my shots are 1-shot groups, clean, lightly lube and do`er again. So, my barrels don't get real hot unless they end up laying in the sun.
 
Posts: 9920 | Location: Carolinas, USA | Registered: 22 April 2001Reply With Quote
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Maybe I am very lucky because I have burned out 3 barrels. One was the original barrel on my 7MM Weatherby at about 2,000 rounds, the second was the next barrel on the same gun at about 1,000 rounds and then the next barrel on the same gun at about 600 rounds. A lot of those shots were devoloping loads or making sure the sights were on. It would really be good to put those same3,600 rounds through guns shooting game burning out barrels. I am now a lot more conservative about shooting sighting in shots and load development shots and think I may never again burn out a barrel. My worste barrel burning gun now is probably a .338-378 Wea and I spend less tan 20 rounds per year checking zero and less than 20 rounds shooting game with it. it would be nice to live long enough to burn out a barrel!
 
Posts: 278 | Registered: 25 November 2005Reply With Quote
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I've burned out a 243 barrel and a 22.250 barrel in the same gun. A second 22.250 barrel will probably last another 500 or so rounds and it will be gone. This was in a Savage so I can change the barrel myself.

I don't think an overbore cartridge is a disavantage at all in this gun as I can get brand new take off barels for $70-$80 and new Shilens, Pacnor, L-W for a couple of hundred and it only takes me about 20 minutes to change them out.


Frank



"I don't know what there is about buffalo that frightens me so.....He looks like he hates you personally. He looks like you owe him money."
- Robert Ruark, Horn of the Hunter, 1953

NRA Life, SAF Life, CRPA Life, DRSS lite

 
Posts: 12820 | Location: Kentucky, USA | Registered: 30 December 2002Reply With Quote
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I had a 223 factory barrel on a Ruger 77 VT that had 15,000 rounds down it, and it was purchased by someone whom I later ran across whom had put another 2000 rounds down it...

he changed a load on recommendation of Nosler's factory tech guy.. but with a load of 25 grains of H 335, and a 55 grain ballistic tip.. he shot a group you could cover with a dime at 100 yds.... with a barrel that had 17,000 rounds down it...

I let it go originally for the reason the groups were opening up for me, and I was looking to rebarrel it... however the local gun shop offered me $400.00 for it ( I had paid $300.0 for it when I bought it).. that trade in and $200.00 and I got me a new Savage 12 BVSS which I was looking at...


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Posts: 9316 | Location: Between Confusion and Lunacy ( Portland OR & San Francisco CA) | Registered: 12 September 2007Reply With Quote
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i['ve burnt out several 308 barrels, but usually they would take 10-15000 before going sour. the quickest was a swift (a shaw barrel) shot it out in 800 rounds if i remember right. hell of a PD town I think i went through those 800 rounds in a matter of 3 hours or so, even the wood was hot. probably wouldn't have hurt a good barrel so much
 
Posts: 13466 | Location: faribault mn | Registered: 16 November 2004Reply With Quote
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I've shot out a 22-250 barrel but I haven't the slightest idea of the number of rounds that went thru it as I don't keep track of things like that. It made several trips to WY for Pdogs and a lot of local shooting and factory matches so it was a bunch.
Regardless of the cartridge, a little self-discipline in your rate of fire can make a rifle last a long time.
 
Posts: 1287 | Registered: 11 January 2007Reply With Quote
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I have a .270 win that I think is burned out after around 5.000 shots. I'll get a gunsmith to check it over and make a direct comparisation shooting a good gun at the same time. It used to be the most forgiving gun ever, with almost the same impact point regardless of load and anybody could shoot well with it. It might not be burned out but just enough burned that the clip stops me from using the ideal COL.

As I think of it might only have made 3/4"@100m, or better groups with Sierra Gamekings, and I quit using them. One more thing to check. I really want to put a 280 Rem barrel on it anyway.

Sometimes I'm low on self-dicipline
 
Posts: 408 | Location: Bardu, Norway | Registered: 25 August 2007Reply With Quote
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quote:
Originally posted by 900 SS:
I have a .270 win that I think is burned out after around 5.000 shots. I'll get a gunsmith to check it over and make a direct comparisation shooting a good gun at the same time. It used to be the most forgiving gun ever, with almost the same impact point regardless of load and anybody could shoot well with it. It might not be burned out but just enough burned that the clip stops me from using the ideal COL.

As I think of it might only have made 3/4"@100m, or better groups with Sierra Gamekings, and I quit using them. One more thing to check. I really want to put a 280 Rem barrel on it anyway.

Sometimes I'm low on self-dicipline




I got a big smile when I read your utterly honest post. Nice to see a shooter with a lot of introspection. That, and your hankering for a .280, reminds me of a story I have told here before....

....Had a buddy (Roger) who was trying to sell a .280 barreled FN Mauser at our gun club's monthly swap-meet. He wanted $250. I asked why he was selling it (I recognized it as a rifle one of the starting pitchers for the Houston Astros had built for himself, by a local gunsmith).

Roger told me it was shot out, or at least the throat was. It had originally been a genuine 1/2 MOA hunting rifle (that means often 1/2 MOA, almost never larger than 3/4 MOA groups), but now he said it grouped about 2 MOA at 100 yards. I passed it up.


The next month, he still had it, so I decided to buy it even though I don't much care for 2 MOA rifles after my BR experiences. (Got spoiled.) Figured I could always re-barrel it, and that was cheap for a gun with a nice custom stock, Mauser action, M70-style safety, etc. So, I laid down $250. Roger said, no, it was $200 now and handed $50 and the rifle back.

I took it home, and like I do with all rifles I buy, new or used, cleaned it. Got a lot of copper out, so kept cleaning it until it was squeaky clean (several days of WipeOut). Took it out and shot it with a case full of H4831 and Barnes-X bullets. Got honest 1/2 MOA groups just like I had seen it produce in Niper's hands when it was first built. It likes ReLoder 19 even better.

So was it burnt out? Not so as I can tell.....
 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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quote:
Originally posted by 900 SS:
...I really want to put a 280 Rem barrel on it anyway.

Sometimes I'm low on self-dicipline
rotflmoClassic - which I sure understand! rotflmo
 
Posts: 9920 | Location: Carolinas, USA | Registered: 22 April 2001Reply With Quote
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Roll EyesWell after studying this thread and doing some evaluation on some comments made I thought perhaps that Ruger .257 Roberts Varminter hasn't got a shot out barrel after all. My cousins been shooting it for a few years now and It never occured to me that it might be copper fouled.

I asked him to bring it over today and told him up front that my intention was to see if it needed to really be cleaned. He thought that wouldn't be all bad.

First a strong degreaser was used to remove all the powder residue and stuff that isn't copper. After that copper "sludge" has been coming out for the last 4 hours. A week will be spent trying to get ALL the copper out possible. From what is being seen there is a strong possibilty that this rifle may again produce those nice small groups. Eeker

We shall see and a great big thank you for getting my gray matter to operate again. homerroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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I participated in an M1 qualification match in the '70's at High Valley Gun Club range near Yucca Valley,CA and noticed an older shooter firing at the 600 yard simulator targets with a 30-06 Springfield 03 ,he put all of his shots in or very near the bull, his shooting coat had 2 emblems on the back National High Power Rifle Champion 1950 & 1951,I asked him about his rifle & how many shots he had fired thru it,he said in excess of 50,000 & he only had approx 6 inches of rifling left near the muzzle but he still hit the bull 99% of the time.How many others here have equaled that fete?His rifle was still accurate!!
 
Posts: 1116 | Registered: 27 April 2006Reply With Quote
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I had a 7mm Remington Mag. 700 BDL that I bought new in 1969. I have the action at the gunsmith as we speak. I must have put 4500 or so shots thru that barrel. Shot a lot of game with it over the years. It would keep bullets under a half a dollar coin with just about any load, wet or dry, hot or cold. The smith bore scoped it, and the first 6 or so inches of barrel had no rifling at all. It still shot ok. Most will never really shoot a barrel out, most problems are do to fouling. On the other hand more barrels been worn out thru improper cleaning than anything else. You could buy a hunting rifle today, and settle on a load and then go hunt for the next 50 or 60 years and the barrel will still be going strong, for your grandson to do the same thing.
 
Posts: 1070 | Location: East Haddam, CT | Registered: 16 July 2000Reply With Quote
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quote:
Originally posted by bartsche:
... After that copper "sludge" has been coming out for the last 4 hours. A week will be spent trying to get ALL the copper out possible. From what is being seen there is a strong possibilty that this rifle may again produce those nice small groups. Eeker...
You still scrubbing?

Did you ask him what his normal Cleaning Routine happened to be?
 
Posts: 9920 | Location: Carolinas, USA | Registered: 22 April 2001Reply With Quote
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quote:
Originally posted by Hot Core:
quote:
Originally posted by bartsche:
... After that copper "sludge" has been coming out for the last 4 hours. A week will be spent trying to get ALL the copper out possible. From what is being seen there is a strong possibilty that this rifle may again produce those nice small groups. Eeker...
You still scrubbing?

Frowner YUP Roll Eyesroger

Did you ask him what his normal Cleaning Routine happened to be?


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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With absolutely no empirical evidence I'm convinced that the two greatest culprits to barrel burnout are Velocity and Heat. Secondary factor would be length of bullet...

I haven't burned a barrel out, and don't suspect I ever will. I shoot maybe 500 rounds of rifle a year.

On the other hand I did put 12,000 (yeah, you read it right) of .45 ACP downrange one year out of my Smith 625 doing some IPSC - Lite stuff at my local indoor range. In some cases my rangemaster would do some stupid long shooting strings - like 50+ rounds at a time. I tell ya, that 625 would get HOT.

Anyway, 12k rounds later that bore is bright and shiny with no viable signs of wear. A nice, fat, slow moving cartidge is going to take a long time to burn a barrel out.

I've got .22 pistols with over 50,000 rounds through them - they still group 1" at 50 feet...

IMO, burning out a barrel requires a certain level of dedication! Cool One should only be so lucky as to have those kinds of problems!


Regards,

Robert

******************************
H4350! It stays crunchy in milk longer!
 
Posts: 2322 | Location: Greater Nashville, TN | Registered: 23 June 2006Reply With Quote
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I've seen a couple barrels burned out in a single day shooting pdogs on hot days in SD. I have owned 1 rifle that burned barrels, a Winchester 70 XTR Sporter that had been rechambered from 22-250 to 22-6mm. I never could fine a pet load for that rifle, as the throat eroded faster than I could test loads.

Jeff
 
Posts: 993 | Location: Omaha, NE, USA | Registered: 11 May 2005Reply With Quote
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quote:
Originally posted by rnovi:
With absolutely no empirical evidence I'm convinced that the two greatest culprits to barrel burnout are Velocity and Heat.


It took a while but there in is the real culprit in erosion; heat created by high temperature coinciding with High pressure over "TIME". The bullet abrasion and high temp gas blasting of course are large contributors. also.

The "TIME" associated with this is multi facited and in itself would make for an interesting discussion. shockerroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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I must admit while reading all of the post I was a little confused by some of the comments regarding dirty bores and barrel burn out then hunting rifles ?.

If a weapon has reasonable care and kept clean then NO Hunting weapon should ever wear out as someone has already stated . It should be able to be passed from generation too generation .

My Commercial Mauser L 3000 7MM Rem Mag. ,Circa 1963 bought brand new has K's of rounds through it. Some target as well as hunting . It still groups #5 into or under an inch .

Match weapons are a completely different animal in my arsenal any way and IMO.

When after a shooting session cleaning a weapon properly and not over cleaning is and should be a normal function .

If one shoots K's of rounds a year then the wear factor is increased correct ?. As opposed to someone who may shoot 12-20 rounds for hunting a year .

Ammo is another consideration lead bullets actually protect a bore to a degree , jacketed projectiles accelerate the wear slightly depending on jacket material hardness and Design .
Armor piercing, tracers greatly accelerates the wear factors . Now combine velocity and burn rate or heat of a powder it also contributes .

The greatest Damage a Bore can receive besides Rusting out is excessive rapid firing which builds heat and breaks down tempering of the metal !.

When rifling starts to disappear any where in the bore , wear is occurring and NO Amount of cleaning is going to bring it back .

When are they shot out ?. No one can predict or say with certainty for any given weapon .

Shoot Straight Know Your Target . ... salute

Salute to ALL Veterans salute salute
 
Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006Reply With Quote
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I pretty much agree with most of your last post, Dr. K... The only part I have some problems with is the part on AP ammo increasing bore wear. Are there not numerous U.S. government arsenal reports which indicate that rifles fired with the very hard core .30 AP ammo have significantly LONGER accuracy life than the plain lead-core rounds? Counter-intuitive I know, but that's what ones I've read said.

Still and all, you are pretty much on the money about bore care and the life of a hunting rifle barrel. From my point of view, there are a lot of advantages to Weatherby-type cartridges for hunters, and not enough barrel-life diminuation to keep them from being worthwhile.
 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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Saturday I took the Savage 22.250 to the range with me and put 50 rounds through it so it has about 450 left. It will still hold around 3/4" groups at 100 yards and rolled over a dozen ground squirrels out past the 300 yard berm.


Frank



"I don't know what there is about buffalo that frightens me so.....He looks like he hates you personally. He looks like you owe him money."
- Robert Ruark, Horn of the Hunter, 1953

NRA Life, SAF Life, CRPA Life, DRSS lite

 
Posts: 12820 | Location: Kentucky, USA | Registered: 30 December 2002Reply With Quote
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AC; I'm no ballistics anything so I may very well be wrong . It just seemed like common sense as those projectiles were loaded hotter than normal rounds . Some had various coatings some had none some were encased some weren't .

I read and copied this from a military Armory report . Below is a long winded exert from that report .


Rifle armor-piercing ammunition generally carries its hardened penetrator within a copper or cupro-nickel jacket, similar to the jacket that would surround lead in a conventional projectile. Although generally more dense as to add weight to the projectile . Upon impact on a hard target, the copper case is destroyed, but the penetrator continues its motion and penetrates the substance.

The entire projectile is not normally made of the same material( although some have been ) as the penetrator because the physical characteristics that make a good penetrator (tough, hard metal) make the material equally harmful to the barrel of the gun firing the round. Combined with a phosphorus coating for tracer rounds the erosive effects were found to be detrimental to bore longevity .

Contrary to common belief, Teflon or other coatings on the bullet do not in themselves help it penetrate deeper. Teflon-coated bullets were meant to help reduce the wear on the barrel as a result of firing hardened projectiles. Teflon coating was a trend that has largely faded, in part because of laws resulting from this misconception.

Shoot Straight Know Your Target . ... salute
 
Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006Reply With Quote
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Well, Dr. K, that is an interesting quote, but I am not buying it yet.

I KNOW the U.S. NRA has published information stating that the exclusive use of AP ammo almost doubles the accuracy life of tested Springfield barrels, and though I am not going to spend a ton of time digging up references and typing them in here, I seem to recall Hatcher's Notebook said the same thing. (Of course, it could have been some other guru.) I know for a fact that numerous other folks who had intimate knowledge of arsenal tests said the same thing.

As you no doubt know, Arsenals test ALL their ammo relative to barrel wear, as part of the approval process. What that leaves us with is the same thing I used to run into in court as an expert witness...one expert says one thing, another expert says something else.


My country gal's just a moonshiner's daughter, but I love her still.

 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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Dr. K.

Even though I did not think I would have the time to find much of this info when I made the above post, here is some "cited" information for you and anyone else who cares to read it. This is by Quintin Kernaghan & Col. B.R. Lewis (U.S. Army). It is found in an article titled "Barrel Life", on page 147 of The NRA Handloaders Guide (1969):

"Beginning about 1945, Frankford Arsenal fired for testing purposes a large quantity of cal .30 ammunitiion (.30-06) loaded with the M2 armor-piercing (AP)bullet, which is several grains lighter than the 172 grain M1 bullet but is very similar in performace at direct-fire ranges. The ammunition was loaded with IMR powders to standard service velocity. This firing was done in machine rests with heavy test barrels ordinarily used for acceptance testing of both bullets and assembled rounds. After several months it became evident that the plot of accuracy vs. rounds fired was consistently following a well defined pattern.

"With a normal new test barrel, the accuracy improved quite noticeably during the first 500 to 1,000 rounds. Then (it continued to improve) at a more gradual rate up to 2,000 or 3,000. The general impression had always been (with standard ball ammo) that after that many rounds, one could expect a gradual deterioration in accuracy corresponding to the advance of the throat. However, from plots of firings it was evident that the accuracy [B]continued to improve[/B at a slow rate for many thousand shots more. The test barrels were kept in service to about 8,000 rounds, at which point the improvement seemed to be levelling off, but the indication was that they could have been fired up to 10,000 rounds without any appreciable loss in acuracy.

"With the service 152 grain ball bullet there was no such prolonged improvement, the accuracy levelling off at about 2,000 rounds and starting to deteriorate a few thousand rounds after that."



Somewhere around here I have a copy of a similar test done at Lake City Arsenal about 10-12 years ago with 7.62x51 ammo. It shows the same thing. If I can find it within the next few days, I will post it.


My country gal's just a moonshiner's daughter, but I love her still.

 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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It's why I stated I wasn't sure as I've read conflicting reports . I just don't know about that aspect of it for sure .

Which is no different from any other studies of any kind depends on who's doing the testing and for what motivational reasons . Like Pharmaceutical studies or political polls .

The lighter AP rounds were loaded hotter so as to have the same general trajectory , this being a given fact . Throat erosion would increase wouldn't it ?.

I've emptied and weighed charges examined an identified various powders from almost every Military and Commercial round known .

How ever it doesn't make me any kind of an expert . Even though I know the correct procedures in doing so and worked in powder manufacturing .

As I never conducted barrel testing of any sort and simply relied on what I'd read .

You may very well be correct .

Shoot Straight Know Your Target . ... salute
 
Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006Reply With Quote
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FrownerAfter 5 days of cleaning the Ruger .257 roberts keeps yielding a lot of BLUE-GREEN. EekerHopefully this is a good thing.

In 1957 I was given an 03-A3 with a pistol grip stock and a 4 groove barrel. It was a factory reject and had only one round fired through it and it came with the rifle. The rifle had been rejected as it did not eject the spent cartridge. The ejector blade had not been installed.

I ran into a great buy on tracer ammo and after 100 rounds about a three inch group at best was all the 03-A3 was good for. Has anyone had similar experience with tracer ammo? thumbdownroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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Roger- I had a similar experience at Ft. Lewis, Washington with my issue M-1 Garand in the mid 1950's. I fired a 246/250 with it the first time through in qualifying on the KD range, including 200, 300, 600, and 1,000 yards. It was a very accurate service rifle.

Then I was detailed to provide some mock suppressive fire with tracer ammo. The bore damage which resulted was clear to the naked eye, and the armorer refused to even accept the gun back until the First Soldier explained to him what I had been doing with it. Until then, the Armorer had been all set to charge me more than a month's pay for replacing the rifle.

It is my understanding that API (Armor Piercing Incendiary) is just as bad, though I have not fired that in any of my rifles.


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Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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quote:
Originally posted:


The lighter AP rounds were loaded hotter so as to have the same general trajectory , this being a given fact . Throat erosion would increase wouldn't it ?. :




Maybe, maybe not. Would depend on the characteristics of the powder and the pressure curve, I would think. My guess is that the answer is probably "yes".

Still, for the purposes of this discusion, the question is whether the AP ammo was causing harm to the barrel which hurt the accuracy? To the contrary, the reports I have read which I can more or less trust, indicate exactly the opposite....that .30-'06 AP IMPROVES accuracy for about 8,000 rounds. So, even if the throat is advancing during that period, is that a BAD thing?

To make a decision, one would have to also evaluate the integrity and motivation of the folks reporting their findings. I know who the folks are who wrote the cited NRA report, and I know they had no commercial axe to grind when reporting the results.

I do not know that with many of the conflicting reports....in fact a quick search of the internet will show a LOT of conflicting statements, pretty much every one of which can usually be identified with a person who is clearly guessing, based on "logic" or folk lore (not experience), or who has a commercial boat to row.

Sure wish I had the time to dig through the several thousand tomes here to find the Lake City report I eferred to earlier....IIRC, it indicated 7.62x51 acuracy increasing in test barels for 13,600 rounds or thereabouts, but then my memory MAY be playing tricks on me, so don't take that as a statement of fact. At this point is isn't.

Best wishes,

AC
 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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AC ; It really doesn't matter one way or the other .

I'm sure your not shooting any of the AP rounds neither am I .
Just for reference purposes
I used to read government reports some times ,there would be entire paragraphs missing , even black marking pens through different sentences .

I did however pull #4 projectiles off of Armor Piercing, M2 & M72 match ammo and weighed the charges against each other .

1.9 & 2.4 grains more powder in the M2 cartridges with a 152 grain projectile than was in the M72 Ball a 173 grain projectile LC 1965 match . I don't have any M1 Ball which isn't some surplus Korean boxer primed crap , so I couldn't compare that .

Powders appeared to be identical . However appearances are deceiving so I'm not saying they are .


Now days
I'm interested in accuracy along with a good expanding bullet , hunting is secondary unfortunately to my paper punching .

Woes of a shaky Economy prevents my hunting more than I would like .

Take Care .

I'm having one hell of a time staying connected or posting on AR ( I'm on satellite with superior speed ) so it must be a server band issue with the forum ?.

Shoot Straight Know Your Target . ... salute
 
Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006Reply With Quote
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Originally posted by Dr.K:
I'm having one hell of a time staying connected or posting on AR ( I'm on satellite with superior speed ) so it must be a server band issue with the forum ?.


shockerME 2 or too or also. Frownerroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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Me 3 !! I note that if I take a different cyber route (hat is, leave the site, shut down my own server, then hook up again) then for two or three pages the AR site functions with normal speed.

Then abruptly it goes on the fritz again, either not responding at all, freezing on one particular screen or another, or responding with a timing similar to a monitored-post site.

If I were back in my old days, I would say we are being monitored by a not too competent (or electronially unsophisticated) third or fourth party. But, in this instance, I suspect that somewhere in the routing from here to there and back there is some electronic device in early stages of failure. Whatever, it is sure becoming a pain in the butt.
 
Posts: 9685 | Location: Cave Creek 85331, USA | Registered: 17 August 2001Reply With Quote
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I think it's their host server either is incapable of handling the volume or past post storage issues or both perhaps ?.

I'm on my deck with my Lap top . A slight steady breeze with occasional gusts up to 15 mph . The rock wall which is squirrel central is about 55-70 yards away . The good Doctor #5 , squirrels #2 Avocado's and my Cantaloupe plant !. Todays Weapon of choice , my Diana Model 40 RWS in .177 Caliber .Although I may need to switch to either my Air Arms or Ruger .17 mach 2, as it's a stretch whacking them over 60 Yd.!.


Shoot Straight Know Your Target . ... salute
 
Posts: 1738 | Location: Southern Calif. | Registered: 08 April 2006Reply With Quote
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We have looked - with a bore scope - at the throats of many rifles in different calibers.

And 2 of the worst were the A-Square 300 Pegasus and the 30-378 Weatherby.

If I remember rightly, the 300 Pegasus had quite bad throat errosion after about 100 rounds throug it.

That was the worst I have seen in any rifle before or since.


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Posts: 69671 | Location: Dubai, UAE | Registered: 08 January 1998Reply With Quote
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Gentlemen,

We have an issue with the forum software.

Apparently it cannot cope with the large amount of data we have.

The hosting company and software developer are working on letting us have a more advanced software, which they have promised will be able to handle the large increase in both traffic and content.

We will do that as soon as they are able to made the upgrade.

We are just as frustrated with te current behaviour of the forums as you are.

Please bear with us.


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Posts: 69671 | Location: Dubai, UAE | Registered: 08 January 1998Reply With Quote
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Do polygon rifled barrels burn out at a slower rate that regular barrels?
 
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