Bears
I know nothing about bears so um... bear with me
I think even thought stats support spray people have a hard time trusting in a spray as much as something as physical as a bullet. Myself I would just NOT go fishing if there was a good chance of seeing a bear the size of my Pathfinder. If I did however I would take spray ,a handgun chambered for a round able to deliver roughly the same energy as a diesel locomotive at 60mph and a friend with the same. I am a huge fan of the Nuke it from orbit way of thinking so see no reason to try and get by with a pea shooter when there are 400-500 caliber handguns. Like any self defense situation use enough gun AND train for the even.
Seriously though, there seem to be some real experts here with real world knowledge of the matter. Listen to the experts.
Anyone seen the handgun chambered for 50BMG? That should do the trick no?
You will still loose an arm but it wont be from the bear.