Hmmmmmmmm....
Interesting thoughts,
but I'll add this:
If carrying an auto, let's just say for arguements sake 9mm+P or above, and let's also just say yours has a mag capacity of over 7 rounds
And you have the time to see or hear or even SENCE the bear is approaching rapidly, anything over 5 or more hits from said gun should either kill said animal or persuade it to alter it's course...this provided you are able to get at least 5 good hits, on the move,[cause I don't know about you, but I'm not standin there facing off Mr. Bear] moving most likely on a flanking angle rather than back pedaling; [can you say trip over something and become bear food] not turning and running.
Now switch gears to a wheel gun; 357 or better, otherwise you deserve to be eaten.
My choice when hunting the bear laden woods of VT is a Smith Mountain gun in 45colt. Choice of bullets is always hardcast lead, usually a 265grain Keith bullet moving about 850-950 fps. Always 2 speed loaders, in case you lose one.
Seems bear vs. human threads are on alot of forums. Having only come across two bears in my 20 years of hunting, the first ran off when I came over the rise and he[she] spotted me, the other, turned towards me, bluff charged and then ran after I fired a shot in the vicinity of the bear. Both were at estimated distances of say 50 yards. The shot did not come from a handgun, but from a lever [45colt] with 6 rounds behind the one that hit the tree by the bear.
No need to kill what is not being hunted or truly not a threat.
my .02