Agree that a sharp head well placed is key. I've been fortunate to kill half doz. bears and have used both 2 & 3 blade heads. But what happens if I mess up, and say hit the scapula? Settled on Zwickey No Mercy SB heads after testing on green Bear shoulder blades. With 52# LB, shot through the scapula leaned against a stump and then had to hammer & chisel the broadhead out of the stump heartwood. Not the most scientific test, but made a believer out of me and took last 3 bears with that broadhead. Hope this is helpful. Todd