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本帖最后由 PhilipJ 于 2014-3-4 10:54 编辑
据Tod Green的经验，膛线磨去1/3，打了5000发子弹的枪管，还可以打得很准。所以我感觉这个3000发的数目不靠铺，土工的枪再差也不会比美帝的差一个数量级吧。连续mag dump打钢壳223也得5000-10000发枪管才废掉，手枪弹3000发怎么也应该是小意思啊。
http://pistol-training.com/archives/8648
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The barrel pictured here (left) is from my Springfield Custom Shop 9mm Warren edition 1911 at a little over 53,000 rounds. It’s seen a steady diet of mostly +p pressure, lead-free ammunition. The barrel has been cleaned about twenty times, so once every 2,500 rounds or so on average.
The rifling has been completely worn away from the first third of the bore. We’re not just talking about lead and carbon fouling. We’re not talking about some little scratch or imperfection. A sizable chunk of the barrel is now smoothbore.
So with such tremendous damage the gun must surely be inaccurate as heck, right?
Well, earlier this week, Bill Riehl of Blackfire Engineering tested the gun in a Ransom rest as part of a comprehensive (and scientific) examination of the pistol. Result? At thirty-five yards, a ten shot group of Federal match ammunition measured 2.04″! Riehl specifically tests at thirty-five yards because it better detects minor stability issues than the traditional 25yd most pistol shooters use. And while you can only extrapolate roughly, the 2.04″ group at 35yd suggests you’d probably see sub-1.5″ at 25yd… in a barrel missing a third of its rifling, in a gun that’s got well over 50,000 rounds through it.
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发表于 2014-3-4 07:10
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发表于 2014-3-4 07:37
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