We come to a point that we must ask ourselves what the extra power of cartridges like .454 Casull, .480 Ruger, .475 Linebaugh, .460 S&W, and .500 S&W really get us. The name of the game when we're talking about handguns for bear defense is placement and penetration. Now, while the monster magnums are certainly capable of more than enough penetration, their very heavy recoil isn't going to do much to help you with placement.
A .44 Magnum, on the other hand, still has more than adequate penetration when loaded with 240gr or heavier hardcast bullets at respectable velocity and, while certainly no pea shooter, produces much less recoil than the monster magnums do. .44 Magnum also has cheaper and more widely available ammunition for the non-reloader and, as we all know, the more you practice the better you will shoot. Were I hiking in bear country, my choice would a a good .44 Magnum revolver (I like S&W but Ruger makes a good revolver too) loaded with something like Federal's 300gr Castcore.