I would have to agree, there is enough anecdotal evidence about "speed kills" to believe it's of some value.
The hydraulic effect, in simple systems with incompressible fluids, is undeniable - it's what allows a man to lift a truck using a simple jack. And some have suggested a bullet impact can cause a bunch of blood vessels to burst in the critter's brain. But all the critter's body structures are not perfect fluids, so it's hard to generalize.
I knew one guy who swore that the .22-250 was the ultimate deer round. But get enough beers in him, he'd admit to losing a few. And he eventually went back to the .25-06
Me? I've never seen a .270 Winchester give anything but bang flops
