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Response to jimmy the one (Reply #32)

Sat Apr 27, 2013, 09:07 AM

33. the rest of the story

The change of the original 1 in 14 inch barrel twist rate of the AR15 to the 1 in 12 inch barrel twist rate in the M16 and XM16E1, resulted in greater long range accuracy and better bullet stability. However, it also resulted in making the bullet less likely to tumble on impact with soft tissue. Much of the spectacular wounding ability of the original AR15 in the Vietnam War was on account of the 1 in 14 twist and the bullets tendency to tumble and possibly also fragment after impact. In recent lab testing of M855, it has been shown that the bullets do not fragment reliably or consistently from round-to-round, displaying widely variable performance. In several cases, yawing did not begin until 710 in of penetration. This was with all rounds coming from the same manufacturer. This lack of wounding capacity typically becomes an increasingly significant issue as range increases (e.g., ranges over 50 m when using an M4 or 200 m when using an M16) or when penetrating heavy clothing, but this problem is compounded in shorter-barreled weapons. The 14.5 inches (37 cm) barrel of the U.S. military's M4 carbine generates considerably less initial velocity than the longer 20" barrel found on the M16, and terminal performance can be a particular problem with the M4.


http://en.wikipedia.org/wiki/5.56%C3%9745mm_NATO

So it is about the stability of a light weight bullet going that fast. that being the case, the same should be true if it were fired from a AUG, G36, or a bolt action using the round with the same rifling twist and barrel length.

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