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I've found the opinions of military personal to be no more accurate than internet or gun shop chatter.
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That's a good statement. i spent a career in US Army EOD. Never shot anyone in combat. But i have killed a large number of wild hogs using the 5.56mm M193 rifle round. The effects of that bullet are devastating at ranges to about 150 yards when fired from a 20" or longer barrel: The bullet penetrates about 6", yaws and fragments. At lower velocities the magic is gone.
US Army Colonel and medical Dr. Martin Fackler, treated combat gunshot wounds. Dr. Fackler also conducted tests on military ammunition.
Wounds produced at velocities in excess of about 2,750 fps prove the M193 5.56mm bullet to be devastating. Conversely, the US Army 7.62mm M80 ball ammunition is not as effective. The German 7.62mm NATO ball round is much better.
http://kjg-munition.de/Zielwirkung/m..._patterns.html