The little black bears in the east, like Florida, only 760 lbs, a 9mm will do,
for the smaller bears in places like jellystone??
Facts about Florida Black Bears: Biology | FWC (myfwc.com)
There have been two male bears that are considered the largest in the state. One was a 740 lb bear and the other was 760 lb bear, both were found in 2015 in Seminole County lingering in neighborhoods after gaining access to unsecured human-provided attractants.
The two largest female bears found in Florida were 460 pounds killed in a vehicle strike in Lake County in 2019 and the other was 400 pounds, found on the side of a road (killed by a vehicle strike) in January 2007 in Liberty County.
A lot of bear: Yellowstone grizzly weighs in at near-record 712 pounds - Cheyenne, WY Cap City News
In fact, he said, the only heavier Yellowstone-region grizzly bear ever documented was encountered all the way back in 1977. That beast of a bruin was a 715-pound male.
For the glock only gun, a g21 with one of these barrels and a full super/rowland load
with a 230 fn or 250 fn cast boolit, like one of these,
6 Cavity Mold 452-230-TC by Lee (midsouthshooterssupply.com)
6 Cavity Mold 452-255-RF by Lee (midsouthshooterssupply.com)
You could load this one down to 10mm power too, around 1175
to 1225 fps, or load it up to 460 Rowland power, 1450 fps,
Double Cavity Mold 452-200-RF by Lee (midsouthshooterssupply.com)
If you do want to get more power from one of the best guns glock makes,
G21, you will probably have better results with barrels like these,
Lone Wolf Arms Glock 21 .45 ACP Threaded Barrel, .578x28 | 13% Off 4.8 Star Rating w/ Free Shipping and Handling (opticsplanet.com)
LWD Barrel M/21 45ACP 9" Length - Lone Wolf Arms (lonewolfdist.com)
The 9'' can always be cut to around six inches to be more user friendly.
Yes, I do have most of what is posted above for woods carry
and much more, still like my magnum revovlers better.
NC and some other states do have bigger black bears than Florida
and jellystone.