blackhawk's got it pegged, it's practice, practice, practice, and the best bang for your buck is boards, get ya some hickory, white oak or hard maple and make more bows, i've built lot's of board self bows @ 60# and up, just gotta get the design and the tiller down, and your skill level up, but i'll say that there have been lot's of game killed with 40-45# bows, Bub