I am with Redhawk, a 45-70 will really thump it. But..., I would really have to think about the single shot anything on dangerous game. Although black bear are not hard to kill, a wounded one could be dangerous to you or your dogs. If need be, how fast can you reload? Faster than it can cover 150yrds. I doubt it. Also, every once in a while, a young male will be pretty aggressive, if you miss your first shot, you may be dinner.