I'm using 6.5PRC for hunting, depending on the cartridge or your reload you can take a moose out up to 500yrd. I haven't started reloading hunting rounds so I'm using factory hunting ammo.
Ie: Hornaday Hunter Precision 143gr EDL-X still has enough energy @ 1600ish ft-lbs vs. 6.5CM has about the same but at 300yrd ( a moose you don't really want under 1550 ft-lbs)
Most places I hunt moose are up to 400yrds, so it suits my needs. I used to hunt with a .300WSM that I gave to a new hunter in our group. Heh, you can also take out a moose with a 30-30, but gotta be close. Get what suits you and enjoy. Hunting caliber topics are the same as "what brand/type of oil should I put in my motorcycle".
In the end what you want is, know your rifle/the round your shooting with. Shoot it (not just 2-3 days before the hunt to make sure the scope is sighted correctly).
In the end, what matter is have fun with it and enjoy you time in the woods

Even if I don't get one, I enjoy the memories and the quality time spent with my group every seasons.
That's my 2¢