Amendments are irrelevant to me, because I live on the civilized side of the border.
Since the big Q is also on the civilized side, handguns and a lot of the best long-arms are legal no-no's. I would shoot a bear (or anything else) only in self-defense. Leaving the scene is always my first choice, unless I have to defend someone else. In the case of a bear, my weapon of choice would be a 10 or 12 gauge pump shotgun stuffed with SSG magnums. (I think that Yanks call them 00 buckshot.) A couple of those upside your face will seriously garner your attention, regardless of how furry you are.
I have to get into an extensive conversation with Turbo regarding Glocks, but that's for later. My carry companion was a Llama Model IX, which is almost exactly the same as a 1911-A1 Colt but with a couple of extra non-invasive safeties. That totaled 5 safeties in the gun itself, and I built a 6th into the home-made holster. There was no way in the world, including fire, that could make that thing go off unless I wanted it to. (I mentioned fire only for the benefit on non-gunners who seem to think that 3-Stooges movies were accurate. A cooked-off round probably wouldn't kill a mouse.)
About 20 years ago, I promised the ex-from-hell that I wouldn't kill anything that wasn't chasing me down an alley. Luckily, I was put on anti-depressants for my ADD soon after. (I still refer to them as my "I don't want to kill anybody today pills".)
Due to a minor conflict with the law, my firearms were confiscated and melted down years ago. So, starting over... my new best friend, when I can get my mitts on one, will be the Colt New Agent .45 ACP. I like Turbo's choice of the 10 mm in principle, but even with my home-made explosive rounds that cartridge presents more of an over-penetration hazard than I care for.
edit: By the bye, I am not educated. Never finished high-school. I love irritating people who did, though.