Fed. CC is good, and http://www.buffalobore.com/ammunition/default.htm#357

1850 mv w/180 at above link looks to be a solid performer, should penetrate well.

I'd just be sure to shoot only if I had to, not wait too till a bear gets too close before lead starts to fly and aim true.

Yes, a 45/70 lever, 350 mag, etc. would make me more comfortable if I planned to really need something for a defensive encounter.