spacecoast, inside 200 yards the 7.62x39 will have more energy, beyond that the 5.56x45mm will, HOWEVER, inside the 200 yards the 5.56 is still well above the threshhold for being quite lethal, as dead = dead no matter what somethings shot with, id take a .223/5.56, though my dislike for the AR15 would lead me to find another rifle besides the AR15 to fire it
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