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Originally Posted by antikristuseke
Thats true for the old 5.56 round and the old barrel rifling twist. The current rounds are heavyer and the rifling twist is different.
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Rifling twist on the 62 gr is 1:7. On the old 55 gr, 1:12. This is what made most manufacturers produce with a 1:9 twist to be able to fire both well. It has absolutely no effect on the fragmentation os the rough, since after it strikes an object, the same yawing will occur - the bullet is back end heavy and twist towards it's center of gravity - the back end. Apporximately at 90 degrees, it will fragment.
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And .45 is a really poor penetrator tbh.
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this is an old myth. I't heavy weight (230 gr) actually makes it one of the best penetrators out there, and it loves to go through objects without slowing down at all. Another myth is that the .357 is an excellent penetrator. As was proven time and time again, it is OK, not great.
Flesh is an excellent back stop for penetration analysis, and to give you an idea, both 5.56 mm rounds (62 and 55 gr) penetrate about equal through flesh - about 13 inches approx. For comparrison purposes and to keep apples to apples, a non expanding 230 FMJ .45 round will penetrate nearly 27 inches through flesh. Even an expanding round like .45 hydrashocks will still reliably hit 18 inches consistently. To compare to a .357 125 gr (JSP even), you get a penetration depth of only 14 inches, much much less than a .45.
-S