The Winchester Firearms Museum wing of the Buffalo Bill Museum in Cody has several muzzleloaders, including Hawkens if you are interested. The BB Museum also has a Native American wing, Western Art wing, Natural History wing along with Buffalo Bill wing. The north entrance at Gardner MT is the only entrance open this time of year. You can drive through the Lamar Valley to Cooke City MT and back. Beautiful drive and you may see bison and elk this time of year. The Museum of the Mountain Man is small but very nice. If you are interested in that time period, check out the collection of journals they produce and sell over the counter or with a membership. If you are coming from the east, the Museum of the Fur Trad in Chadron NB is also interesting. They have a fantastic collection of Trae Guns.