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Long Range Hunting & Shooting
What really causes a barrel to wear out...
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<blockquote data-quote="westcliffe01" data-source="post: 1579819" data-attributes="member: 35183"><p>I watched a "Torture test" of some AR-15 rifles on youtube. I think something like 5000 rounds fired through each of them with periodic accuracy testing. At the end they basically had no rifling left and only shot slightly worse than at the beginning.... </p><p></p><p>Wait, there's the catch. None of the rifles were better than 2.5MOA when brand new and thats at a close distance 50-100 yards. If your barrel is so crap to begin with, how are you ever to tell any degradation ? How would you know if you were shooting a smoothbore instead of a rifle, if the shooting distance is so short that you dont even give the bullet a chance to tumble ?</p><p></p><p>I suspect that rifles that are still shooting well with a throat that has been shot out to 12" long are most likely shooting light for twist bullets that are able to stabilize in the remaining rifling and are still going fast enough, even if there is some blow by in the first part of the bore. Trying a rifle in this state with a bullet that is close to maximum weight for twist will probably show a completely different result.</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 1579819, member: 35183"] I watched a "Torture test" of some AR-15 rifles on youtube. I think something like 5000 rounds fired through each of them with periodic accuracy testing. At the end they basically had no rifling left and only shot slightly worse than at the beginning.... Wait, there's the catch. None of the rifles were better than 2.5MOA when brand new and thats at a close distance 50-100 yards. If your barrel is so crap to begin with, how are you ever to tell any degradation ? How would you know if you were shooting a smoothbore instead of a rifle, if the shooting distance is so short that you dont even give the bullet a chance to tumble ? I suspect that rifles that are still shooting well with a throat that has been shot out to 12" long are most likely shooting light for twist bullets that are able to stabilize in the remaining rifling and are still going fast enough, even if there is some blow by in the first part of the bore. Trying a rifle in this state with a bullet that is close to maximum weight for twist will probably show a completely different result. [/QUOTE]
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What really causes a barrel to wear out...
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