I was just out camping in pretty remote black bear country here in Oregon a few weekends ago. Although I had a Ruger Redhawk 4" loaded with Buffalo Bore 300-grain solids on my hip, I felt my best defenses were: cleaning up really well after cooking, putting everything that remotely smelled like food, including the clothes we were wearing while cooking, into a sealed-up truck at night, and talking loudly to each other while out hiking the trails. Let them know you're there, and you'll likely never see them. Practice awareness, be clean and careful with food smells, make plenty of noise while on the trails, then worry about the hardware on your hip. And remember, a .357 Magnum in the hands of someone who has practiced A LOT beats a .500 S&W in the hands of someone who hasn't.
I think the best weapons for black bear defense (not hunting) in the hands of an experienced shooter, in order, would be:
1. 12 gauge pump with hardcast rifled slugs
2. 45-70 lever-action rifle
3. Other lever-action rifle (.44, .45LC, .357, .30-30)
4. Any of the super-duper magnum handguns (.500, .475, .460, .454)
5. .44 Magnum revolver
6. .45 LC revolver (properly loaded-up)
7. .41 Magnum revolver (properly loaded-up)
8. .357 Magnum revolver