Moose are babies - generally. Even a bad shot will usually find the moose dead in it's bed - if given time to stiffen up and die. Of course, be prepared to shoot him getting up, if really badly shot the first time, like a gut shot. Don't shoot them in the guts. The kill zone is almost 3' in diameter. Shoot him through the lungs. The result is a dead moose within 50 yards of where he was shot.
Few years back, I watched a moose shot through both lungs with a .530" round ball from a cheap production muzzleloader. The range was a lasered 170yards by his guide. I wouldn't have allowed the shot, had I been his guide as I watched the hunter miss an 11" x 8" target at a measly 100yards in camp using a rested shot off my portable bench rest. The hunter lucked the shot in perfectly, double lung and the heart. The moose took off like a horse out of the gate, dropping dead in 40yards. 1/2" hole through the heart and 1" holes throgh both lungs. The ball was under the hide on the off side. The impact vel. might have been 1,200fps, maybe, likely not that high.
Just make a good first shot
Chase him and he'll run like an elk.