Hey, Little John
I think you have speed/energy, etc., mixed up. We're not talking bullets, here. Question for you? Would you rather get hit in the head with a ping pong ball travelling 100 miles/hr., or a baseball travelling 50 miles/hr.? I know what I'd want. One would hurt, the other would probably kill you. Heavy arrows penetrate better... period. With long, heavy, two blade broadheads... period. Read that article in the latest Trad Bowhunter. It's excellent.