I've always found it a good policy to "not arm the bears". If one were to decide to do this however it would be good to remember that bears have rather large paws and perhaps a rifle with a thicker stock would work best.
Trystan
What about their right to Bear arms?
Good point! However that could be interpreted a lot of different ways in congress
With that in mind I've found the 8mm Mauser with a 220 sierra has shown some authority on black bear.
Trystan