Precisely, AZ... John, turn down the flame a bit, because you do not know as much as you think, nor do you read posts carefully enough to respond accurately if your info was correct. No one said the bullet "tumbles" or breaks apart at the muzzle. Effective terminal ballistics of the 5.56mm ball round (M193 or M855) depends upon the bullet yawing upon impact with flesh, and then breaking apart into two or more fragments which create multiple wound tracks during the expansion of the temporary cavity. WHEN that happens, the round is very effective. It happens only at high impact velocities, so very seldom at ranges beyond 200-300 yards. It is, by design, an underpowered assault rifle cartridge inappropriate for most large game.