500 Mag - we must be talking different levels of snow and 4x4s. The Can Am is very capable, BUT...you are still talking a 700lb machine that has 25 or 27 inch tires and 10inches of ground clearance. No doubt it would be fun in the snow, but you aren't going anywhere once it gets 2-3 feet deep - especially a wet or crusted snow that you have to go through for a mile or better. I'm talking snow more like this or deeper...not the snow the red one's in...the snow it just came through. I'm also not talking bone-stock rigs (a Can Am probably would do better). I'm talking BUILT, with lifts, big tires, lockers etc. (neither of these rigs are mine - I was out with them).
(guess all my pics are at the bottom, gotta figure out how to place them in the text).
You can check any serious off-road 4x4 or ATV forum and when the snow gets real deep you either need to be light and get flotation on top of it (think Suzuki Samari with flotation type tires, or old 3-wheeler type balloon tires) - or up to a point, you need ground clearance/big tires.
I'm not saying this to bash quads...I love 4-wheelers, and I was planning to get something like the Can-Am, lift it a bit more and upsize the tires to get me through the deeper snow, but after spending a few hours digging and chugging some large 4-wheelers through drifts at 10,000 feet I knew if I wanted to make sure I could get up or down the mountain when the snow got deep, I needed a purpose-built 4x4 lifted with big tires or a snowmobile. The problem with the snowmobile is that camp is often about 3,000 lower and you can get treacherous deep snow and drifts up high, but start seeing some bare ground down lower - you'd have to trailer the snowmobiles part-way up.
Final example is December hunting the last few years here in CO. I got my daughter and nephew into big herds of elk, all grouped up and on open mountainsides in the morning - with no competition because I had a beefy 4x4, with 37s and cleated chains (see pic). The only other people who made it up on top of the mountain where the elk were before noon were two game wardens on snowmobiles. Finally, about noon, a dozen or more vehicles made it up (nearly stock 4x4s with chains) - even after I'd broken trail, they had to spend hours digging through the drifted/deep areas. ATVs....there were probably 6-8 not more than 1/2 mile off the county road...stuck. The first mile is open prarie with big drifts - the big ATVs and a rzr went nowhere because they just didn't have the clearance or tire size to push through. Unless you have tracks, there aint no way you're getting 4 miles back in that kind of deep stuff on a quad. Again, I'm not a hater...I like them, but admit they have limitations. 1000ccs doesn't help when you a trying to push an 800lb "brick" through snow about as deep as your seat.
You guys there in MT close most of your mountain roads when Archery season starts. We are still driving them into December sometimes - some good and bad to that. I'd love to "square off" on some cold snowy December day - wish you were closer. I guess I'll have to check around for someone with a Can Am or Rzr locally and see if we can give it a try and video it.
Not wanting to hi-jack things...I'm in the market for a new(er) ATV too...but just sharing some of my thinking as I considered options a few years ago.