I wish I could help you out with more than just a general answer. I have never hunted in the snowy mountains. I have been told that there are only a few public access points? For this reason I choose to hunt on the west side of the state where there is more public land.
You can call the Region 4 Montana Fish Wildlife & Parks office in Great Falls, Montana. There phone number is (406) 454-5840. Ask them how the public access is in the Snowy's & also ask them about there block management program in that area.

Good Luck,

WK