Tim, Good advice from Shrewshooter. If your draw is 28" or better, I'd recommend a good 3 blade like the WW or Snuffer for a better blood trail. Bears are not hard to kill with a well placed arrow with some weight to it. Whatever broadhead you use, be sure it will take hair off your arm! I just posted a couple good bear adventures on my site if you want to look at them:
http://www.bowmaker.net/sucess.htm
....O.L.