I have a suggestion, if you are worried about getting eaten by a large bear stay out of it's back yard and don't shoot at it. I don't care what kind of gun you have it does not garauntee a one shot stop. Shooting large dangerous game is... well, dangerous.
I never get this argument when there are people that kill large dangerous game with slug guns, muzzle loaders and bows. I mean I guess if you want to shoot it from 500 yards away, hit it in the foot and have it drop dead than an ultra high powered rifle might be in the cards. But don't sit there and tell us that you HAVE to have that big of a rifle to kill game like that. There have been plenty of animals like that taken cleanly with a 30-06 and lesser cartridges.
My opinion anyway, but then again I don't hunt bear, for the reason stated above. I don't feel like getting eaten by one. Same reason I don't swim in the ocean. I have a pact with sharks, they stay out of my back yard and I'll stay out of theirs
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Paul