The .45 is a good manstopper, but is pretty puny as defense against a bear..The interior grizzlies are smaller than the coastal bears, but hey have to work harder to earn a living, and thus tend to be more aggressive...An ill tempered 500 to 700 pound critter is pretty formidable..

I'd get a good revolver in .44 mag or something more powerful and pray to God I never have reason to use it..