First off you’re replying to a 6 year old post.
AR 10 in 308 might be a better choice.
Bell hunted elephants for ivory…not necessarily for self protection.
A charging Bear, Moose or elephant needs to be put down quickly. The most powerful rifle round I currently own is 30-06. I would choose that. If I could go hotter it would in the .400 to .500 range, though a 12 gauge sabot round is nothing to sneeze at.
Ha, ha. A four year old post! Well, that explains a lot about my life.