I have no experience in a situation like this - and hope I never do. I carry a 10mm auto 'just in case' and my thinking is that I will pull the trigger as many times as possible as quickly as possible with out analyzing bullet performance after each shot. I carry 200gr hard cast. My thinking is that if I can manage to shoot all the way through a bear 10 or 12 or 15 times (hopefully) then twice as many holes can't hurt. If I can shoot through his skull then into his body because of 'too much penetration' how is that a negative?

I have often wondered about the Underwood extreme penetrators also. Their descriptions sound like they would do it all. Who knows?