lazs - there was a gent who worked for HK, who had an AC-556 (NFA Mini 14 variant) as a sample to show clients, at work; Some motorcycle gang members decided to pick a fight with him, that's "the exception that proves the rule"; He had a fair bit of ammo & I suspect he wanted about 5x more by the time that was over. Plus I suspect he'd have liked some backup! Let me look for it... Found it, look up the "Gary Fadden incident", with some Outlaws motorcycle gang members. He was tried for second-degree murder, but he was found innocent on grounds of self-defense. That'd be a high stress day... That one DEFINITELY lasted more than 5 rounds, and even included a NFA firearm.
For myself - I carry 1911 family in city and often revolver in the boonies, bears are better picked on with a revolver with heavier loads being the idea. I picked the 3rd option because, if the shooter does their part, the handgun will too.