2 years ago I accompanied a friend on a Maine moose hunt, where he took a nice 2 1/2 y/o bull with his cape gun. One 90 yard shot from the 11.5x50R broke its spine, and he finished it off with a 16 ga round ball.
He used a pretty-standard cast bullet in the 11.5, 365 grains IIRC. Made his own cases for the 11.5. I'll check with him to see what he used as the parent case. I think it might have been the Lebel, but I could be wrong on that.

fiery, dependable, occasionally transcendent