I pretty much figure
anything you shoot a bear with in a close range confrontation is gonna take a while to work.
In such a short range confrontation IMO a 9mm firing total metal jacketed flat nose ammo with 36+" of penetration, that can be rapid fired super fast while staying on target, is just as liable to not work as anything else. A bear head is at least as big as the average man's torso and if he's facing you his head will be pretty much centered in his silhouette, so it's no different than shooting a moving human center mass when you target a moving bear's noggin.
Bear's are fast, but so are big city drugged up "African-American" felons. And IMO the felons are a heck of a lot more dangerous too...and to most- just as scary.
Anyway, a high velocity 9mm to the brain will kill pretty much anything instantly. Obviously it's not ideal, but it'd be better a whole fkload better than harsh language. It's certainly a better choice than my 5.56mm AR.
I so need a shotgun. I could kick myself for ever selling my Beretta 12ga.