How many shots do you think you can fire before burning out a 300 win barrell from bench shooting?

I could be done in 100 rounds.....just continue to shoot it after it glows red!!!!

Fired prudently I'd guess about 3,000 rounds.

The number of rounds fired depends on how they are loaded. A comfortable middle of the road load, pressure wise. I would expect good hunting accuracy to exceed 6000 firings. A hot rod load running at max. pressure, the count would go down very fast.
I think Vapodog's estimates would apply. 100 to 3000.

Other factors to consider are what do you call acceptable accuracy? A minute of angle, a minute and a half?
And how many rounds in the group. Hunting groups are hopefully one out of a cold barrel. Benchrest five. Highpower 22 in 22 minutes and 10 in one minute.
You see too many variables to give a hard and fast rule of thumb.

muck

/

Alf, where's that from?

Took me a bit of studying to recognize that that table is listing barrel life of rounds for which the given powder is near the center of the burning rate range. Thus, a .30 caliber for which Bullseye was near the center of the burning rate range at 60,000 PSI must be something between a .32 ACP and .30 Carbine. Something for which H870 is at the center of the burning rate range at 60,000 PSI is a monstrous supermagnum. In more normal cartridges like my .300 Weatherby, it's a slow burning powder that gives mild pressures and long barrel life. In smaller cartridges like the .30-06, it's a reduced load powder in a full case load.

I don't know how they arrived at the barrel lives they gave, but I'd say my .300 Weatherby and the original poster's .300 Win Mag fall into the class of .30 calibers where 4350's a midrange powder. 3000 rounds is the corresponding number in the table, which is in line with what I'm expecting of mine. We'll see, though. Mine's probably only around the 1000 round mark, and still capable of sub MOA accuracy. Wonder if the long freebore in the new barrel will lessen the apparent effects of throat erosion?

From my experience,if you shoot for maximum velocity a 300WM will start showing throat erosion after only 20 rds.These are twenty rds fired slowly.The bottom land will start to thin out really fast.I think it is not an exageration to say that at max listed velocities you shoot out a piece of your barrel with each firing.You will no longer group within an inch at 200 after 70 or so rds.I don't know how long they will go before they stop grouping as tight at 100,because I get rid of the barrel when it stops shooting at 200.

If you consider how much data and equipment would be required to generate that table it must be full of assumptions. Most probably a cdomputer program. Is it anywhere correct ?.
Good Luck!

quote:

From my experience,if you shoot for maximum velocity a 300WM will start showing throat erosion after only 20 rds.

I don't have equipment to see that so will just accept it as it stands....but this does bring up the tough part of the question.....just what do we use as a guide to say when the barrel is burned out???

Mostly for me the barrel is NOT burned out as long as it continues to deliver acceptable accuracy and that point is different for each of us.....for some it may be when it only achieves 1.5" groups.....I assure you that it's still fine in my gun cabinet however!!!

There's much more to this question than it seems.

quote:

Originally posted by shootaway:
From my experience,if you shoot for maximum velocity a 300WM will start showing throat erosion after only 20 rds.These are twenty rds fired slowly.The bottom land will start to thin out really fast.I think it is not an exageration to say that at max listed velocities you shoot out a piece of your barrel with each firing.You will no longer group within an inch at 200 after 70 or so rds.I don't know how long they will go before they stop grouping as tight at 100,because I get rid of the barrel when it stops shooting at 200.

Vapodog,you don't need equipment to see that.It is easily visible if you remove the bolt and look down the action and chamber.Fire 100 rds and see what it looks like before and after.Stonecreek,if you don't know that,it is because you have never really used a rifle.Too much relaxing happening with you.

I put 2000+ rounds (mostly bench) through the last barrel on my 338/378 Wby and it still delivered acceptable, but not exceptional accuracy. It still shot good enough that I'm going to have it set back, rechambered and installed on another gun, and I'm throwing way more powder down the tube than the 300 WM.

If the rifle stops grouping within 2 inches at 200yds then it probably will not group less than a foot at 300yds.It becomes more difficult to group the farther out you shoot.So,if a rifle in a calibre for long distance shooting will not group beyond 100 or 200yds,then what's the point of keeping the barrel? If you want to shoot something at 300yds you are better off with max. velocities.It takes just one hot load to damage your barrel.A hundred rds will kill accuracy at 200 yds.

quote:

Originally posted by shootaway:
If the rifle stops grouping within 2 inches at 200yds then it probably will not group less than a foot at 300yds.

Soooo..., if a rifle shoots 3-shots into 2.1" at 200yds, then by shootaways definition, 3-shots at 300yds will not be inside a 12" group.

Needless to say, that concept is colloquially refered to as - Full-of-Beans!

quote:

It becomes more difficult to group the farther out you shoot. ...

And shootaway would have that part absolutely correct.

quote:

A hundred rds will kill accuracy at 200 yds.

Possible if done in haste, but highly unlikely if done with a modicum of firearms knowledge. (aka Half Full-of-Beans)

quote:

Originally posted by Hot Core:

quote:

Originally posted by shootaway:
If the rifle stops grouping within 2 inches at 200yds then it probably will not group less than a foot at 300yds.

Soooo..., if a rifle shoots 3-shots into 2.1" at 200yds, then by shootaways definition, 3-shots at 300yds will not be inside a 12" group.

Needless to say, that concept is colloquially refered to as - Full-of-Beans!

quote:

It becomes more difficult to group the farther out you shoot. ...

And shootaway would have that part absolutely correct.

quote:

A hundred rds will kill accuracy at 200 yds.

Possible if done in haste, but highly unlikely if done with a modicum of firearms knowledge. (aka Half Full-of-Beans)

Maybe the Canuck version of MOA differs from the US version?

quote:

Originally posted by craigster:
...Maybe the Canuck version of MOA differs from the US version?

May be it is!

(Mentally picture a Frozen Brain Icon for our Canuk buddies)

I wonder what the Californian is like?

I flushed out the novices as usuall.

or a hot swamp-like one in yours Hot Core(Been there once in the summer and I swear I'll never visit again during that time of year.If there is a hell on earth then the Carolinas in the summer come close)

After 15 yrs of trying to make my 30gibbs a magnum the throat is about 1/2" longer and the accuracy is not what it once was.

quote:

Originally posted by shootaway:
I flushed out the novices as usuall.

Yeah something got flushed alright! At least it sounded like a flushing sound way up north of me!

If you're shooting out barrels in 1-200 rounds, you must be cleaning with sand or something!

The subject of barrel life distinguishes all the riflemen from mere mindless weekend outdoor freaks like grizz.

quote:

Originally posted by shootaway:
....If there is a hell on earth then the Carolinas in the summer comes close...

Hey Shootaway, PLEASE pass that "Canuck Wisdom" on to ANY other YANKEES you run in to.

But, you would be welcome back - ANYTIME. Merry Christmas and a Happy New Year.

Merry Christmas!

Bart Bobbit's barrel life formula from 1992:
http://groups.google.com/group/rec.guns/msg/40e27dd4201...=UTF-8&output=gplain

He is still around and answering questions at rec.guns, but I don't know if he still competes at Camp Perry.

How much would a barrel need to degrade before you stop shooting it?
Judging by the 22-250s for sale at the gun show, until the throat looks rough from 3 feet away.

All,
I asked this question some time ago regarding my 264 winnie, one of the replies was very interesting,he had read in an old G&A that throat erosion was significantly reduced if you used ball powders like H870.
Does anybody recall this article...
Just for the record my M70 in 264 winmag is shooting better now than it ever has after about 800 rounds of max loads, 90% were loaded with H870, the first batch were loaded with Rel 22 or H4831 sc..

regards
griff

Hello,
Been shooting long range prone matches for many years and the 300 Win. Mag, 7mm Rem. Mag used fair amount and those who use them on a regular basis seem to think that the pristine accuracy needed at 600-1000 yards w/ micrometer sights goes away in the early teens area i.e., 1100 -1300 rounds?? Throat area takes a lot of punishment. Mind you that twenty rounds plus sighters in 30 minutes is normal and the barrel is quite hot to say the least. This is repeated three times in a complete match. (Realize this type of shooting is not typical of a sporting rifle.) Can tell you that a quick call to Sierra will give you a pretty good answer on all of these questions plus.