I drew a ML bull moose tag 8-9 years ago or so where I live in Colorado. Only one bull permitted here in a lifetime, unlimited cows if you can manage to draw. I hunted with a TC Renegade .54 shooting a 440 gr. maxiball that I cast, powered by 105 gr. of Pyrodex RS. It was a successful hunt, I harvested a middle size bull, probably about 700-800 pounds live weight. All I know for sure about that is that my high school aged son and I could not pull it over onto its back with both of us pulling. I ended up shooting it 3 times even though the first shot was fatal. The first shot was behind the shoulder broadside at 80 yards, in a clearing. It stumbled when I shot, then walked into a willow thicket. I found out later that I had hit both lungs. After it walked off and the adrenaline wore down, my son and I waited about 45 minutes figuring it would lie down and die in the meantime.There was a good blood trail at the start on the willows about chest high on me, and then it disappeared. My son and I split up, but I found it 75 yards further on lying down, but it's head was still up and it tried to stand when it saw me. I shot it in the chest again and it fell flat on it's side, me thinking it was finished. I reloaded and called for my son to join me, and as my my son was busting through the willows towards me and yelling for directions, the moose's head came up and it tried to get it's front feet under it, and so I shot it again, this time in the neck at the base of the skull and finished it for good. I recovered both bullets from the chest shots under the hide on the offside - complete penetration and energy dump! Both slugs had mushroomed to about 3/4 inches (I cast them a little hard), both pretty intact having only hit ribs and lungs. The entry holes were about 3" apart, the slugs about 10" apart where they stopped. I have no doubt that if I would have waited a little longer I would have found it dead. I have seen elk do the same thing, they're both very big and tough animals. Next time I think I would try to get a little closer and make sure I got the heart.