While I live in the middle of moose and black bear country, Moose hunting requires too much activity that I'm no longer to physically accomplish. My only .54 is percussion with a 33" barrel. It has killed deer. I've found 60 grains of 3F to be super accurate in my .54 and I feel that is a good deer load. A deer I killed with it fell to 110 grains of 3F (excellent load) but that much is not necessary for deer. Moose are large enough that heavier loads and harder ball makes sense to me.