Hunting ammo and rifle choices aren't that hard ; you almost have to go to extremes to get into trouble. A middle of the road approach takes care of most of it.
You don't want to use the softest bullet on the biggest game, the hardest on the smallest, the smallest caliber on the biggest game (or perhaps the biggest on the smallest), and the lightest and heaviest bullets can equally be viewed with suspicion. Anytime you get the extreme edge of a range of anything you should question what you are doing that requires it.
The 185 is a lightening killer on deer sized game, but I've never had one exit yet. I'm trying to think of one that I found much of anything left on deer, which is definitely hinting toward pushing it on moose.
The Berger is on the extreme soft end of the spectrum, and the moose (at least in North America) is on the big end of the spectrum for animal size. Classic mismatch; but on a broad-side shot through the ribs you'd probably get away with it anyway. Thing is; why push the limits?