I carry a .338 when hunting deer in brown bear country. When I get my 35 Whelen built, I'll feel comfortable also.
A story from back in 2007 when a guy got ruffed up a bit while carrying his 6 mm. This is not to say a bigger gun would have helped in this case as the bear got to him first.
http://juneauempire.com/stories/120207/loc_20071202016.shtml
