I just saw Apaloosa
Ed Harris (who also co-wrote the screenplay and directed the movie) and Viggo Mortensen.
This was a classic sort of western. It's worth seeing for the movie, by the way. There is a story and a realistic subplot or two. Characters are more than two-dimensional.
The gun work is really quite first rate.
The story is set in the early 1880s. The rifles are all either 1866 Winchesters, 1873 Winchesters, one what appears to be a Spencer carbine - something with a side hammer and not a Sharps. I think one Trapdoor Springfield. No 1892 or 1894 Winchesters; Good for them!
Handguns are varied and time correct. SAA Colts, a Schofield or other S&W top break, one revolver looks like one of the converted percussion pistols.
Shotguns are all SxS, with exposed hammers. One of the protagonists carries a 8 guage (looked more like a 10 to me, but what do I know). In certain lights, it seems to be a Damascus barreled gun - exposed hammers of course. In keeping with the time and black powder technology, it's a long barreled gun.
The only 'errors' I spotted were technical things. One fellow had a holstered single action with obvious brass grip straps. So he was either carrying a Colt Dragoon or a modern SAA copy by the shape of the grip straps and grips. The other technical error was a local wearing their hat backwards. (If one is familiar with the Mexican 'sombrero', one will spot it.)
Over all, good movie.
The shooting scenes were very believable. Mostly one handed with sidearms, no fanning or speed holsters, some misses and a reasonable amount of smoke. One of the best bits of gun work in the movie happens in the first gunfight by the protagonists. The first thing they do when the shooting stops is what? Have a drink? Bow their heads? High five each other? No. They reloaded. Right there and then standing over the bodies of the late lamenteds. I've been waiting dang near all my life to see that.