Thank God iraqis use 7.62x39 and 7.62x54R bullets that usually leave clean wounds
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Oh my! a ballistician no less.
One of the prevailing thoughts on using the 5.56 is that it maims rather than kills its victim outright. This is a two bladed sword so bear with me and see if you agree.
Blade one: The 5.56 causes wounds that require medical treatment of wounded soldiers on the battlefield. A wounded soldier requries no less than two soldiers to clear from the battle area. Therefore three soldiers are disabled from the fight. This works out nicely if your fighting an organized army the fights with the same ethics as we do. Never leave a soldier behind etc etc.
Blade two: the 5.56 has been found over and over, time after time to do either one of two things: Pass so sharply and quickly through the body of the victim so that the combatant doesnt realize instantly that he has been wounded and continues fighting for some time (not good), or requires multiple hits to disable permanently. Unfortunately, most of the armies or fighting units on the recienving end of the 5.56 dont give a damn about their wounded.
As far as the AK is concerned. The way most armies use the AK is as an general assault weapon of uneducated untrained paramilitaries. That is, they dont take aim and fire. They tend to shoot large bursts in the direction of the enemy. Not that this is a bad thing. Just doesnt tear down the fighting units like one would really want in a fight. If you watch some of the 101st fighting in the Raq, you will see them taking aim and firing single rounds. Far better IMO.
Afterthought:
In the battle of Somalia, one of the special forces, I recal a SEAL, insisted on using a rifle chambered in 308. I think it was a M14 but dont call me on it. Over and over the soldiers fighting their way out of the Mog were dismayed to see skinnies continue fighting after taking mutiple hits with 5.56 and this guy with the 308 had everyones lust because his rifle, although heavy and unwieldy, was dropping the skinnies flat after a single shots through the midsection.
We fight to live and will prevail against those that fight to die. Its simple human economics.