Ghosts of the past.
You are taking me back to my old Buckskinner days and back then, I was really into the books. There were many fur trapping companies that were all over the Rockies and even up into Canada. Hugh Glass was a hunter for one of these companies as well a Jim Bridger and a whole bunch of other fellas. Sadly my memory is going to pot but I still have some of my old books. Also, look for a book by Janice Holt Giles named The Great Adventure. I know for a fact, that there are a bunch of books on the subject. Also Google "The Buffalo Hunters. These were market hunters that almost wiped out the American Bison. There is a whole range of black powder cartridges use such as the 45/70, 45/90, 110 and bigger loads in the 45's as well as the 50's.
Be Safe !!!
'Fundamental truths' are easy to recognize because they are verified daily through simple observation and thus, require no testing.