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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
4,000+ fps How Long to Burn the Barrel
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<blockquote data-quote="Bart B" data-source="post: 552386" data-attributes="member: 5302"><p>Cartridges burning 1 grain of powder for each square millimeter of the bore's cross sectional area produce this many rounds of barrel life before a fall off in accuracy will usually be seen:</p><p></p><p>1/4 MOA (at worst) at 100 yards to start with, 3000 rounds of barrel life.</p><p></p><p>1/2 to 3/4 MOA starting out at 100 yards, 6000 rounds of barrel life.</p><p></p><p>1 to 1.5 MOA, 10,000 rounds. These are the typical numbers for US 30 caliber service rifles, the M1 and M14. I would imagine the 5.56 NATO would be close to the same, but have no experience or other info to go on.</p><p></p><p>Double the powder charge weight for a given bore and barrel life goes down to 1/4 as many shots.</p></blockquote><p></p>
[QUOTE="Bart B, post: 552386, member: 5302"] Cartridges burning 1 grain of powder for each square millimeter of the bore's cross sectional area produce this many rounds of barrel life before a fall off in accuracy will usually be seen: 1/4 MOA (at worst) at 100 yards to start with, 3000 rounds of barrel life. 1/2 to 3/4 MOA starting out at 100 yards, 6000 rounds of barrel life. 1 to 1.5 MOA, 10,000 rounds. These are the typical numbers for US 30 caliber service rifles, the M1 and M14. I would imagine the 5.56 NATO would be close to the same, but have no experience or other info to go on. Double the powder charge weight for a given bore and barrel life goes down to 1/4 as many shots. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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4,000+ fps How Long to Burn the Barrel
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