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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Life - key factors?
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<blockquote data-quote="Bart B" data-source="post: 571487" data-attributes="member: 5302"><p>I came up with a formula some years go that seems to me and lots of others to be about right.</p><p></p><p>Barrel life will be about 3000 rounds of best accuracy when there's one grain of powder for each square millimeter of the bore's cross section. </p><p></p><p>Increase powder charge 40 to 50 percent for that bore diameter and barrel life gets cut in half.</p><p></p><p>Double the amount of powder for that caliber and barrel life goes down to about 1/4th as many rounds.</p><p></p><p>The above applies to top quality barrels that start out shooting no worse than 1/4 moa at 100 yards. Barrels starting out shooting 1/2 to 1 moa seem to last twice as long; 5000 to 6000 rounds of accuracy at that level.</p><p></p><p>And the rest that start out at 1 to 2 MOA at 100 yards will last 10,000 to 12,000 rounds before noticable accuracy drops off. Standard 30 caliber service rifles fall into this categore.</p><p></p><p>How well one shoots plays into the observable barrel life. Top accuracy shooters will see a given barrel start going bad sooner than those that aren't so accurate in their shooting skills.</p><p></p><p>Sierra Bullets replaces their .308 Win. test barrels as they start shooting 10 shot test groups that go up to about 3/8 moa that happens at about 3000 rounds. They keep several hundred rounds of any lot of bullets that shoot exceptionally well in their rail guns. Some of ther 30 caliber Match Kings would shoot under 2/10ths MOA round after round and they would keep those as "standards" to shoot once in a while to see when their test barrel was going bad. Same for other calibers. Sierra used to put some of those super accurate bullets in plain brown boxes then sell them through two guys at high power rifle matches but that stopped in the early 1990's. They shot much more accurate than the ones they sold in green boxes.</p><p></p><p>Compared to .22 rimfire ammo, the US Olympic Team members rebarrel their rifles when they've got about 30,000 rounds through them. Starting out a sub 1/2 moa at 50 meters with a good lot of ammo, they know when bullets start striking too far from where they called the shot.</p></blockquote><p></p>
[QUOTE="Bart B, post: 571487, member: 5302"] I came up with a formula some years go that seems to me and lots of others to be about right. Barrel life will be about 3000 rounds of best accuracy when there's one grain of powder for each square millimeter of the bore's cross section. Increase powder charge 40 to 50 percent for that bore diameter and barrel life gets cut in half. Double the amount of powder for that caliber and barrel life goes down to about 1/4th as many rounds. The above applies to top quality barrels that start out shooting no worse than 1/4 moa at 100 yards. Barrels starting out shooting 1/2 to 1 moa seem to last twice as long; 5000 to 6000 rounds of accuracy at that level. And the rest that start out at 1 to 2 MOA at 100 yards will last 10,000 to 12,000 rounds before noticable accuracy drops off. Standard 30 caliber service rifles fall into this categore. How well one shoots plays into the observable barrel life. Top accuracy shooters will see a given barrel start going bad sooner than those that aren't so accurate in their shooting skills. Sierra Bullets replaces their .308 Win. test barrels as they start shooting 10 shot test groups that go up to about 3/8 moa that happens at about 3000 rounds. They keep several hundred rounds of any lot of bullets that shoot exceptionally well in their rail guns. Some of ther 30 caliber Match Kings would shoot under 2/10ths MOA round after round and they would keep those as "standards" to shoot once in a while to see when their test barrel was going bad. Same for other calibers. Sierra used to put some of those super accurate bullets in plain brown boxes then sell them through two guys at high power rifle matches but that stopped in the early 1990's. They shot much more accurate than the ones they sold in green boxes. Compared to .22 rimfire ammo, the US Olympic Team members rebarrel their rifles when they've got about 30,000 rounds through them. Starting out a sub 1/2 moa at 50 meters with a good lot of ammo, they know when bullets start striking too far from where they called the shot. [/QUOTE]
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Barrel Life - key factors?
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