Just a simple opinion, but if you have to defend yourself with a gun,... bear bangers might be a bit too late... full load double 00 buck shot, or bird shot to the head may just save you from being dinner.
sure you carry the regular ammo, but its more for black bears, where they are more curious then anything and you cant kill one unless in mortal danger in a provincial park. More for the situation I had in the summer, where my food is all locked up, and the black bear comes in at 2 am and starts eating my dishes and nocking over my stove and lantern, so to prevent further damage, just load a bearbanger in the tent and come out and pop one off and the bear runs.
Not in mortal danger, just pissed that my dishes and latern are distroyed at 2 am and being woke up.
Plus, othe situations, say you come accross a bear in the spring, backwoods camping, and its not that scared of you, then you notice the cubs, well you know the bear will be more aggressive because of the cubs and being in protective mode. You could easily have a proble, and the cubs are more curious and can come over to you. a banger will send the whole family running and no need to orphin a few cubs.
My gun will have regular ammo, the bangers are just a secondary non lethal back up, that if you have time, load one in.