.338 RUM or .358 STA!
However, the next time I go moose hunting, I plan to get within 100 yards and use my .73" Jaeger firing a .735", 597.5 grain round ball with 150 grains of Swiss FFG. I figure this will also dump any grizzly that gets close enough to bite me!
http://img.photobucket.com/albums/v444/eldeguello/1.jpg