You might consider something like this pre-War Merkel in caliber 8X65R. This is a Brenneke cartridge, whose performance is not much lower than the .333 Jeffery, a highly regarded plains game cartridge. The 8X65R would be a terrific cartridge for elk or moose, and the double rifle configuration lends itself to driven game hunting as well. http://www.egun.de/market/item.php?id=4434215