My experience has shown me that moose aren't especially diificult to kill it just takes them a long time for them to realize they're dead.
Their lungs are huge so it takes a long time for them to fill up with blood. I've killed two big Canada bulls and I killed both of them with centerfire rifles. If I were to ever get drawn in Maine I wouldn't hesitate to take a Muzzleloader. If time wasn't a factor and I had all season to pick my shot I would consider the bow... One thing you could consider doing is going with the bow and have your subpermitee carry your muzzleloader. You could always grab the M/L if the ideal bow shot doesn't present itself. Just an idea....
Jim B.