Moose are huge but they aren't tough. Your rifle and ammo combo is more than enough. Bring lots of rope and come-a-longs for field dressing. They're a chore to cut up. If you don't already know how to filet out big game without gutting, then learn how. There's no point gutting an animal you'll almost certainly need to quarter. The DVD Love, Thunder, & Bull 2 is a great resource for learning moose vocalizations. The bull magnet is a great moose call.
Good luck,
Jeff