Johnson teaching his new wife to speak English:
Johnson, "great hunter"
Wife, "yes"
Johnson, "fine figure of a man"
Wife, "yes"
One of the interesting things mentioned about Johnson at Trail Town was that he would WALK from Red Lodge to the DeMaris hot springs (now on the fringes of Cody right below Trail Town) every few weeks to soak in the springs. It helped relieve his arthritis. Red Lodge to Cody is about 40 to 45 miles.
A boy scout troop in So Cal was partly responsible for getting Johnson reburied at Trail Town. There is a lot of information about it at Trail Town, newspaper clippings, etc.
Johnsons Hawken gun is at the Cody Firearms Museum. It's a .56 cal. Most Hawken guns were in calibers 50 to 56 from what I have learned. Where the film makers get a 30 cal Hawken is beyond me. It would be a squirrel gun.
It's true that occasionally guns were rebored, but it wasn't a yearly or regular thing. Many guns went their entire, (and long) life in the original caliber. It was generally wear, and perhaps loss of accuracy from lots of use, that determined when it was time to rebore. I recall reading from traders and trappers reports on supplies laid in for a years time in the mountains they would generally have enough powder, lead, and caps for about 100 shots.