Are you hunting the bear? Or carrying insurance in case of a bear attack while conducting some other activity? Both are very different things. 5.56mm is a very

Are you hunting the bear? Or carrying insurance in case of a bear attack while conducting some other activity? Both are very different things. 5.56mm is a very small cartridge for game that large, and with full auto you will spray wide and in a few seconds have an empty mag. Besides, within 10 feet everything that can go wrong has gone wrong and you will likely get mauled anyway. Large magazine rifles with backup pistols do have a niche in hunting packs of aggressive wild boars in close quarters, but that is an exceedingly dangerous hobby best left to those with a background in door-kicking.