If you get a chance to watch some of the old silent , and early talkie movies , you are in for a treat. They use a lot of period peices, in the making of these older films. The old guns were still around then and they used them along with period leather . The acutal language was also used in the movie dialog, along with the correct grammar.
As the western films became "pulp" productions, in the late'40's and early 50's the old guns had been used up and most were put to pasture, the "all in one blank" made it's appearence and thats when all the revolvers went to '73's and rifles '94's.
The only film I can relate is the B&W film remastered by Ted Turner "CIMARRON" a film in the late thirtys, if you ever get a chance to see it don't forget to record it, you'll wear out the pause and rewind button on the remote, going back and stopping to check out what kind of gun the guy is brandishing!
I'm back, just googled western movie CIMARRON, and found out it was best picture for 1931 the only other western with that claim to fame is THE UNFORGIVEN by none other than Rowdy Yates aka Clint Eastwood. Both are examples of carefull studies in american history, and reflect a lot of truth in the production and direction !