I suspect that wheellock pistols and carbines were used more by mounted troops than others until replaced by some form of flintlock, mainly because of the difficulty of using a matchlock while mounted. Although they were expensive, acquiring and maintaining a horse was probably more expensive.
I have heard of Harold Peterson and his books starting in the 1950s but I'm not sure I've actually ever read one. I think he also wrote a book entitled "The Last Mountain Man" about a character in Montana, whose name escapes me at the moment.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.