I've found that bear are easy to kill that whitetails. with an arrow. Every bear I've killed (16)with an arrow has not gone as far as a deer, before it bled out. I don't see it necessay to have a real heavy arrow for anything except if you're going to hunt elephant or water buffalo, or bow fishing. Too light of an arrow is not good either, you have to find the right balance for flat shooting, accurate and penetration. F.O.C. is important to all three as is the correct broadhead. Only way to know what is bestfor your bow, is trial and error.