I read about some that liked a glock 10mm for bear country, a .44mag s/w mountain gun or 629 4in barrel, the ruger .454 alaskan can also shoot .45LC,
a dan wesson .445 super mag will also shoot .44mag, .44sp. and can change barrel lengths, the .657mag is haddy since most can handle the recoil and can load .38 spe. I have a dan wesson 15-2 reveolver pack a 357mag with 2.5,4,6,8in barrels I usually carry it with the 4in barrel attached. By the way dan wesson, ruger (redhawk, srh, sbh, g-100), freedom arms, mag research
desert eagle, and bfr.
I would say use the largest caliber you feel comfortable with shooting. A shootgun and lever action big bore would also be good bear medicine.