There is a fellow that posts over on the leverguns fourum from NW montana IIRC. Some time ago he had a problem with a grizz raiding his chicken coup. His son went out one night when the bear paid another visit armed with some form of remington 20ga loaded with your standard foster slugs. Outcome was 20ga 1 bear 0, IIRC it took two shots to put the bear down IIRC.

Speaking of black bears check out this biggun' shot with a Marlin lever action, probably a 30-30. Paco Kelly's Leverguns.com • View topic - 746 lb. PA Black bear!