Just to start an argument I guess. A buddy and I disagree. He thinks kinetic energy is what you have to look at when matching a load with game. I think momentum is more valid (not perfect, just better). Of course he thinks high velocity is everything, no matter what the game. I personally like big, heavy bullets at more 'sedate' velocities. To push things to the extreme, he likes .22-250 for deer and I would prefer .45/70.
Kinetic energy = 1/2 mass x velocity squared
Momentum = mass x velocity
Kinetic energy = 1/2 mass x velocity squared
Momentum = mass x velocity