I think the 7mm Rem.Mag. can be a good moose caliber depending on the bullet used. Getting the animal down is of prime importance because of the difficulty you can have in quartering it and getting the meat back out. You don't want that animal to wander far after being hit. I've seen several that were hit with .300Win. Mags. and Spitzers make it back into the bush where they were lost. If you've only a short time before dark as is often the case you may not be able to retrieve it. I usually use a round nose or semi-spitzer bullet on moose. I don't really prefer the bullet to pass on through, but to stay in the boiler room. Just one mans opinion. Best wishes.
Cal - Montreal