You ever shoot a bear out of a tree with that .300 WSM?.... ; )
Seriously, as Rmanwill said, any good deer/elk rifle will work as long as you make a good shot using a decent bullet. I've killed four bears, all spot & stalk. One with a .300 WSM, one with a .338 Federal, and two with a .308 (all Kimber Montana's). Shots ranged from 15 yards to 348 yards.