Sam Elliot. Tom Selleck. Scott Glenn. All actors devoted to the genre.
Their movies have some extraordinary authenticity in terms of the period hardware used.
Silverado gave John Cleese what actually seemed to be a break-action British revolver (Webley?). Then there were the two Henry .44 rifles instead of the ubiquitous, generic, anachronistic Winchester 1892.
Somme actors are made for westerns. :)