Well I for one would not hesitate to use a 300 gr XTP (either in .429" or .452") on a black bear. I've taken enough and at different angles to have to agree with Slowburn. Over the years I've come to the conclusion that whitetails are more tenacious at hanging on to life then a big old blackie. Especially on a solid lug shot. But again this is a forum and everyone has their own opinion.