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I think you are correct. Look at the chart IMR 3031 has a lot longer barrel life than 4831. In the 308 you use @40 or so grains of IMR 3031. In a 300 Mag you use @75gr of 4831. DOUBLE RIFLE SHOOTERS SOCIETY | |||
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I know that two people have answered this, but here is my take.... As I read it, the table gives the barrel life for each given powder : when used in a cartridge in which that powder will give the higest velocity for "standard" weight bullets at +- 60,000 psi. So the powder that would give the highest velocity with a 140gr bullet in a 7x57 might be 50 grains of 4350. According to the chart you would get a barrel life of about 3,000 rounds. On the other hand, if you had a 416 Rigby necked down to 7mm, a charge of 4350 that yields 60,000 psi would not give you the highest velocity for a 140 grain bullet for that cartridge. You would need a slower powder. You might find that 100 gr of H50BMG gives you the highest velocity at the 60,000 psi limit. According to the chart, barrel life would be less than 400 rounds. My point is that barrel life if affected more by the amount of powder burned, rather than the type of powder. I think the final line of the chart's explanation spells this out: "so long as cartridge is loaded to full potential, barrel life will be similar, regardless of propellant used." That is what I took from it... But I am often wrong. Jason "You're not hard-core, unless you live hard-core." _______________________ Hunting in Africa is an adventure. The number of variables involved preclude the possibility of a perfect hunt. Some problems will arise. How you decide to handle them will determine how much you enjoy your hunt. Just tell yourself, "it's all part of the adventure." Remember, if Robert Ruark had gotten upset every time problems with Harry Selby's flat bed truck delayed the safari, Horn of the Hunter would have read like an indictment of Selby. But Ruark rolled with the punches, poured some gin, and enjoyed the adventure. -Jason Brown | |||
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Well said. Jason "You're not hard-core, unless you live hard-core." _______________________ Hunting in Africa is an adventure. The number of variables involved preclude the possibility of a perfect hunt. Some problems will arise. How you decide to handle them will determine how much you enjoy your hunt. Just tell yourself, "it's all part of the adventure." Remember, if Robert Ruark had gotten upset every time problems with Harry Selby's flat bed truck delayed the safari, Horn of the Hunter would have read like an indictment of Selby. But Ruark rolled with the punches, poured some gin, and enjoyed the adventure. -Jason Brown | |||
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3648 Mike Legistine actu quod scripsi? Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.  What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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The 308 is one of my favorite hunting cartridges, as is the 9,3x74R and the 375 H&H. However, I have used a 300 Mag quite a bit. I have used a 300 WBY and a 300 Win Mag. I pick the 300 Mag over the others when I am on a hunt where I might have to shoot a long range shot [over 300 yards], and it might be the only shot I get. I do not worry about barrel life, as my main consideration is performance. DOUBLE RIFLE SHOOTERS SOCIETY | |||
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If concerned about barrel life, get a polygonal or Mike Rock 5r, ..otherwise use banded bullets like GScustom-HV. | |||
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Trax, How would that type rifling help barrel life? Other barrel makers have similar rifling to the 5R and they don't last any longer. Shilen's ratchet is about the same. What is there that would help barrel life? Butch | |||
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The way to really extend a barrel's life is chrome-lining. 10,000 rds before accuracy degrades; then there is probably another 20,000 rds of useable barrel life after. Modern chromelined barrels are nearly as accurate as there unlined counterparts. I have had a couple of chromelined Colt AR-15 barrels and they were great. A few of the major barrel makers offer chrome-lining. 4140 is a decent barrel 4150 is a pretty good service life barrel mil std CR-V barrels are long lasting add chromelining to any of the above for even greater wear. PA Bear Hunter, NRA Benefactor | |||
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Butch, Gas leakage at the corners of conventional rifling is a know contributing factor to barrel erosion....the less flame passage-[flame jet effect]between barrel& bullet the better. Theres a known .308win marine sniper test rifle with MR.5r that has done some 14k rounds and still moa or under. ...also .22x64 ,near 3000 rounds at 4400-4700mv [with banded bullets]...and stillunder moa. seriously considering something like 69gnHV -6mm/STW...  69hv 4200mv....(350yd zero) 100yd[+2.15]....400yd[-2.87" 2970v/1352e] 15ft/lb recoil in 8lb rifle. | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Medium Bore Rifles How many rounds will a Krieger barrel last
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