Read Larry Kelly & J.D. Jones' "Hunting for Handgunners", P. 225.
Kelly & Jones were attacked by a charging bear, less than 10 feet away they began blasting at the bear standing in their cabin's door way while they were INSIDE too.
In total 16 rounds of .375 H&H, .44 Magnum and .375 J.D.J. were pumped into the bear, and the bear still ran off and died down on the beach.
Conversely, on page 224 of the same book, Kelly poses for a picture with an Alaskan brown bear downed at 60 yards, by one shot from a .44 Mag.
Food for thought, lest you become food for bear.
Doc2005