There was another recent thread about handguns for bears. If you do a 30 day search for 458Win's posts, you'll find all you need to know.
Then, you can choose who's advice you want to take, 458Win's, who has probably seen more bears shot every year for the last 30 years than most people SEE in their lifetime, or the guys from the states who get all their knowledge from the innanet. (Tough choice, huh?)