Hey Charlie! Welcome to Northern Wild Rides!
I've been snowmobiling out in Montana for the past 4 years, and I have been lucky enought to be able to go to some remarkable places to ride. The one place that stood out to me was Cooke City.
Cooke City is about a 3 hour drive from Bozeman and is located in the Absaroka-Beartooth Wilderness, providing some of the best access to some of the best riding in the entire state. It offers a wide range of terrain, from goomed trails to DEEP powder, making it accessable to all riders. It has been some of the best riding I have done in my whole life, and if you are in for a little bit of a haul, it will be totally worth the time and effort.
Hope this can help narrow down some desions for you!
Stay Wild!