I'm confident that in the short few seconds you have before the bear gets to you, you could empty a magazine (10 rounds canadian of course) into him. Maybe even get off a reload a shoot some more. I think that would hurt it enough although I don't think it would die quickly.
I'd definitely go with 124 gr, over the much slower 147 gr, +p if possible. I would think FMJ would be better than JHP as the bullet would open up prematurely inside the bear and wouldn't cause deep damage, rather superficial (by bear standards).