If you're into dangerous game chasing then 9,3x74-9,3x74/12ga by certain well known Poznan maker would work. It's made on 'Clamshell' action, so it's very expensive. That's hardly surprising, since you probably know how big boys want to pry them shells open! Also it's listed by Puglisi Gun Emporium and they're dreadfully expensive. Exclusive und Expensive BANK