7.62 NATO - (30 Caliber)
Upon entering a fleshy target, the 7.62 bullet travels strait nearly six inches before the massive shock wave ahead of the bullet transfers incredible energy into the target as the bullet begins to tumble. Thus the bullet can exit before the maximum shock wave expansion can occur. 30 Caliber rifle bullets of this type are known to knock men down, and throw them off their feet back some distance. The cartridge is powerful, accurate, and humane in it's ability to kill quickly. The permanent cavity produced remains after the bullet exits the body. The temporary cavity causes tearing of tissues and muscle damage. The temporary cavitation (shock wave) causes death when it impacts the heart or liver but not necessarily in other areas of the torso.
7.62 x 39 (AK-47)
While not quite as devastating as the 30 caliber rounds, the 7.62 x 39 is still quite deadly having an unusual tendency to remain intact even after taking unusual deviations upon contact with bone.
5.56 NATO (.223)
For a little bullet, the 5.56 bullet produces quite dramatic wounds. While the traditional 30-06 caliber bullet of the M1 Garand and 7.62 bullet of the M14 rifle would immediately knock a man down, the 5.56 bullet instead enters the body, quickly turns sideways after passing through only 4" of flesh, then breaks in two major pieces, as well as many smaller fragments. During the Vietnam War, soldiers reported that shooting an enemy soldier with the M16 did not kill as quickly as the old 30 caliber weapons. Instead soldiers would follow a massive trail a blood a few feet away from where the enemy soldier had been hit to find him dead from massive blood loss. This light-weight cartridge permits soldiers to carry more ammo, but is not as effective at long distances as heavier cartridges and does not penetrate steel as well. The low recoil permits quick follow-up shots and minimal muzzle climb during automatic fire. Click here to read about Eugene Stoner and his invention the M16 / AR15.