My normal carry in black bear country used to be a 4" Sec Six in 357mag. Then I got a Vaquero in 45 colt (able to handle the high pressure loads) for occasional trips to grizzly country (and just because I wanted it
). In retrospect, I sorta wish I had just gotten a Blackhawk instead since the Vaqueros really aren't (or weren't) a SAA colt clone.
Since we moved out into the pineywood hills, I haven't been out on the NF much (no need to, really
). Around here (and around the house) I just carry the 357 for general protection since we rarely see bears. But if I go out on the NF again, I will carry the Vaquero "just because" ... and some of those black bears can get really big!
The one time we camped in western MT (Big Hole area), a couple of Rangerettes (cute, too
) stopped by to warn us that there were grizzlies active in the area. I said that we were aware of being in grizzly country and were watching out, but I didn't point out the 45 under my untucked wool shirt
IMO, the best "bear" handgun is the one that you are comfortable with, providing it is at least a 44 magnum or equivalent. It's just another chance anyway - if attacked, you may not have time to even draw and fire a shot, or you might have time to fire a warning shot into the ground and save both yourself and the bear. I am starting to think that a DA might be better than a SA revolver, just because you can find thumbreak holsters for a DA.
A short barreled rifle or shotgun is still the best, as long as it is in your hands. But a handgun will (or can) be with you when you are cooking over a fire, setting up a tent, etc ...
FYI, I have seen lots of black bears in the wild and have never even been threatened. But they are dangerous predators and not cuddly pets. It only takes one bear to eat you and ruin your whole day. Bears' hearing and eyesight are not that extraordinary, and I have both accidently and deliberately gotten pretty close to black bears. My grizzly experience is limited to following fresh dinner-plate sized tracks down a trail through an alder thicket on a back-packing trip in Alaska
(was carrying a shotgun on that excursion)