I like fixed too. Simple and reliable. The guide I used in Canada recommended Snuffer 125 gr. I used a Hoyt Bow Bullet (140 gr.). The blades go in from the front. I passed all the way through my bear and stuck the broadhead in the bait barrel. Then the broadhead came apart. For that reason I don't think I personally would use a mechanical, too many parts. I use a Wasp Hammer SST 100 gr. 3 blade on deer and have enough confidence in it that I wouldn't hesitate to use it on bear.

Darn that Rob, I replied to your other post and Rob locked it just before I submitted this.