Personally, I find that more times than not people get too "into the numbers" and begin to to forget the fact that no matter how much energy any projectile may have when it makes contact with an animal, placement of the projectile as close to the vital areas as possible, will have more impact on how quickly the animal is put down than how much energy the projectile possesses. Energy transfer will also be relative to projectile composition when we start looking at potential energies. You could have a projectile with 1 million ft/lbs of potential energy, but, if the projectile is incapable of releasing it, you have less trauma resulting than if it could. Example..the millitary's use of steel core 5.56 nato ss109 62gr. steel-core penetrators, as opposed to a 62gr, lead core, soft or hollow points. One is designed to NOT expand (release it energy) and the other is...that is why they are outlawed for combat because they will do more damage even though they both have very similar if not the same potential energy. Accuracy is more important to me than how much power my setup my have. But, I will also logically choose an appropriate round for my quarry. Which would be ANY legal round for use in my area. All calibers and setups have killed deer (in my case) including .22LR! Heck, many of the native peoples in the eastern Canadian Provinces regularly use the .30-30win to take moose...it all boils down to how profficient one is with their weapon.