In the state of Idaho legal draw weight to hunt big game is 40#. It is considered (and have been proved to be enough) for moose, elk, sheep, and goat. Don't worry about needing to be a powerhouse. Anything above 40# has been proven to take down big animals. The thing that you need to be worrying about is (as was mentioned before) your accuracy and STAYING WITHIN YOUR OWN PERSONAL LIMITS. Know what those are and don't push yourself beyond them if you know that there is a possibility that an animal will take off with a wound that can cause a slow death or extreme pain in trying to recover. If 60# works for you then stay there. If all you can handle at the time is #40, then make it work for you.