Pretty interesting stuff.
He mentions the dramatic increase in damage from rifle bullets traveling at 2500+ fps. People often mention this without understanding the reason. The speed of sound in water is about 4500fps. The shearing effect of pressure waves generated by the impact of a bullet are amplified by constructive addition of reflected waves, as the speed of the bullet at impact approaches the speed of sound in water, the the shearing force doubles and even trebles (waves are reflected from more than one direction - You can demonstrate this in a bathtub full of water)... The result is a disproportionately large quantity of macerated tissue.