This is a rather odd resumption of the age-old argument between slow, heavy bullets, with greater frontal area, and fast, lighter bullets, with better penetration characteristics. To emphatically conclude this argument, I ask that you contemplate the following question:
Would you rather get hit with a 12-gauge shotgun slug at 1400fps, or a 55gr .223 Remington bullet, at 3250fps? At any range for which either is appropriate, and presuming a center-of-mass hit, I think the answer is patently obvious. The old saying is that speed kills, but when something really big is going fast enough, that's going to kill much better than something tiny, going really fast!
Would you rather get hit with a 12-gauge shotgun slug at 1400fps, or a 55gr .223 Remington bullet, at 3250fps? At any range for which either is appropriate, and presuming a center-of-mass hit, I think the answer is patently obvious. The old saying is that speed kills, but when something really big is going fast enough, that's going to kill much better than something tiny, going really fast!