My only question is why risk your life, or the life of you guide by being undergunned. I agree I wouldn't use anything smaller than a .300 mag. I admit I want to bowhunt the big browns on Kodiack Island. And I will use guide who will be prepared for this and carry a big stick, so to speak. But you can bet I will not use a bow that is set up for whitetails, it will be set up with high KE, and be able to penetrate all the way through the big bear.