More On The Pressure Wave Theory...

You do not have to be a physicist to understand the basic principals behind hydrostatic shock. At high velocities, projectiles tend to impart a pressure wave that assists in incapacitation. There. That this DOES happen is incontrovertible. That it greatly enhances the probability of relatively instant mortality is the real question.

Dr. Courtney believes that a 135 grain bullet traveling at speeds in excess of 1300 fps is more suitable, all things being equal, than a heavier bullet moving along at slower speed. But here's the bottom line:

With regards to an open shot fired directly into high center of mass, I'd tend to agree. However, lighter bullets owe most of their lethality to velocity, and any deflection such as from an arm or object (knife, gun, you name it) being carried by the target will severely deplete the available kinetic energy, and this is a bad thing. Heavier bullets can shed their velocity then continue on to inflict mortal wounds more readily than lighter bullets. For hunting purposes I'd definitely take serious note of the good Doctor's theory, or for bullets of the same caliber and relatively equal weight such as a 9 mm in 124 grains versus a 9 mm in 147 grains. It would appear that the lighter projectile has the edge. This is one of the reasons the old standby .357 magnum round of 125 grains was so effective. 1600 fps is a great deal of giddyup coming from a handgun, but I've personally favored 158 grains clipping along at 1400 fps for my solution to unsociable encounters.

One thing I DO believe, is that Doctor Courtney's work is valuable, and sheds more light upon the subject than shooting bullets into gelatin blocks then crowning the winner to be king of the gun. As someone who despises the .223 as a mankiller, I agree that when fired into a kill zone, at close range, and with no impediments, the round and platform can be effective. Now if only these damned bad guys would simply walk closer and throw their arms out to the side while directly facing us, the task would be far simpler. I have found them to be reluctant to do so, and therein lies my unfavorable feelings concerning the .223. The real world is not a shooting gallery. Nor is a 150 pound deer the equivalent of a large and angry man juiced to the 9's by the pharmaceuticals of his desire.

Light and fast versus slow and heavy. The debate rages on.