>>64137601
I work in bear country as a wildlife biologist, working directly with grizzly bears. Carry a 10mm or .45 Super hard cast Buffalo Bore ammo. Most people opt for 10mm, lots still use 9mm and .40 S&W including CLEOs. Back in May a bear was killed in defense using hard cast 9mm.

Big revolver cartridges suck and most of the documented failures of bear defense rounds are people using revolvers because capacity is king. Bear spray is something kept on everyone regardless of cartridge carried because that deters the vast majority of attacks especially from black bears, but even 95%+ of grizzly attacks as well.