use enough gun !
I 've done some black bear hunting. IME you have to put down black bears with the first shot. Bears are much tougher than deer. A good center shot in the heart- lungs with a standard traditional deer rifle will usually put them down, however, a light hit might only enrage a bear. If he runs you'll probably never find him, and God help you if he charges. Enraged bears will absorb amazing amounts of heavy lead. I've seen this first hand. Do your self, your buddies, and the bears the humane service of using at least a real big game gun with heavy sturdy bullits.