Guys. Read up on Fackler's studies on military projectiles on flesh. Some rounds are designed to yaw, which is the old 303 Brit and 5.45 Russian round's design.
I may be wrong on this but the theory on 5.56 wounding is fragmentation rather than yaw.
Now the recent (for 556) innovation of the 77 grain bullet may have changed over to yaw, again I'm not certain.
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