Not tryin to be dumb, I wouldent bear hunt with a 1911 either, BUT
I did some experimenting with hard cast bullets, 41mag @1350 fps. 210 gr. Those babies went Thru 32 shingles. yep, tar, stone, and fiberglass.
jhp's wouldent come close. Looking at my reload manual, I can get a .45 auto to push a 230gr. hard cast bullet out of a 5" barrel at 980 fps. Add a 4" barrel extension to that and velocity would slightly increase.
Second point is BLACK bears do not have thick hides. Very thin skin compared to a deer. the fat under the skin is what makes penetration to the vitals difficult. a hollow point, or soft lead will mushroom quickly, and stop before it gets to them. I think hc bullets would be the only way to go. fmj's have a round head and wouldent do as much damage as a flat nosed hard cast.
third point is (as mentioned above) black bears can be a hard target to hit properly. a great mass of lumbering black fur.
Now if a fella hit a b bear in the vitals, with a hc flat nosed 230 gr. .45 cal. bullet, going around 1000 fps. within 10-20 yds. What would the outcome be?
Just some worthless thoughts for us to all argue over
God Bless!