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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Capacity versus Barrel Life
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<blockquote data-quote="Bart B" data-source="post: 1154040" data-attributes="member: 5302"><p>coyotezapper,</p><p></p><p>I mentioned in my first post that hunting rifles will have a bigger MOA to start with. And their barrel lives will be longer.</p><p></p><p>My formula is based on 10-shot (or more) group average increasing 50% as the limit for barrel life. Most from Sierra's data using rail guns. With yours going from 1/2 inch to over an inch is a 100% increase. You can use whatever degradatioin standard you want for your objectives. It's based on rail gun and machine rested rifles for the most part so human nonrepeatability in holding and firing will increase group sizes.</p><p></p><p>Poor accuracy for everyone is when the bullets start striking too far from the point of aim for the shooters objectives. Top ranked rifle competitors have smaller limit numbers than hunters. Combat riflemen have the biggest numbers for service rifles and ammo. Competitive .308 Win rifle shooters rebarrel when their 600 yard test groups go from about 3 inches (maximum) to about 5. Arsenal 7.62 NATO M80 service ammo specs at 600 yards are about 20 inches (5 inch mean radius) and shoots about 30 inches in service rifles with new barrels; they're rebarreled at about 11,000 rounds.</p><p></p><p>You didn't mention how the rifle was held aiming it at the target shooting groups. Hand held against your shoulder resting atop bags on a bench? On bags in free recoil untouched by you except a finger on the trigger"</p></blockquote><p></p>
[QUOTE="Bart B, post: 1154040, member: 5302"] coyotezapper, I mentioned in my first post that hunting rifles will have a bigger MOA to start with. And their barrel lives will be longer. My formula is based on 10-shot (or more) group average increasing 50% as the limit for barrel life. Most from Sierra's data using rail guns. With yours going from 1/2 inch to over an inch is a 100% increase. You can use whatever degradatioin standard you want for your objectives. It's based on rail gun and machine rested rifles for the most part so human nonrepeatability in holding and firing will increase group sizes. Poor accuracy for everyone is when the bullets start striking too far from the point of aim for the shooters objectives. Top ranked rifle competitors have smaller limit numbers than hunters. Combat riflemen have the biggest numbers for service rifles and ammo. Competitive .308 Win rifle shooters rebarrel when their 600 yard test groups go from about 3 inches (maximum) to about 5. Arsenal 7.62 NATO M80 service ammo specs at 600 yards are about 20 inches (5 inch mean radius) and shoots about 30 inches in service rifles with new barrels; they're rebarreled at about 11,000 rounds. You didn't mention how the rifle was held aiming it at the target shooting groups. Hand held against your shoulder resting atop bags on a bench? On bags in free recoil untouched by you except a finger on the trigger" [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Capacity versus Barrel Life
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