I love my 7mm Rem Mag and wouldnt be afraid to use it on moose if i got the chance but i would step up to larger bullets than what i use for deer. That is definetly the key to large game animals, quality bullets. Something along the lines of a Nosler partition, Bear Claw or any other slighty more expensive bullet that penetrates good and holds together. Any of your magnums would be a great choices. Heck a Marlin lever action in like 45/70 or 450 marlin mag would probably pound them too since theyve take big bear and elk.

Dave