Can't help you with the outfitter, but assume you asked for references and followed up on them? If not do so!

I have shot over a dozen elk and moose with a 7mm rem mag, no quams here. Moose aren't near as tough as an elk to bring down, however they are still BIG withthick hides, heavy muscle and bone structured so they do require moreof a bullet then deer. Use a well constructed (premium)bullet like a Barnes TSX, Nosler Partition or Accubond, etc., put it where it counts and you'll be eating moose steaks.

Good Luck