If the bear is close, simply fire the cracker shell straight up in the air, that solves the shooting behind him threat. Its been my experience that the sound of live fire is not as effective on a bear as the flash-bang of a cracker shell. More than once I've fired over a bear's head and had him walk away slowly in a stiff legged posture showing his displeasure, others have approached! One guy I know shoots into the dirt immediately in front of them, kicking dirt in their face, which combined with the noise of the shot effectively moves them along, but I won't do it because I believe it creates an unacceptable risk of a wounded bear. A better solution it to have rubber bullets backing up the cracker shells. The pinch they give keeps even the most reluctant bear moving, but aim for a big muscle, in the ribs a rubber slug can kill a bear If you must use less lethal ammo in your primary shotgun, I recommend loading the magazine with slugs and single load the less lethal ammo. Should things go south, you can still land a lethal blow quickly.