Hatfields and McCoys
I think it did a pretty good job of portraying weapons of the time. I read somewhere that Kevin Costner insists on firearm accuracy in his movies. Remember "dances with wolves" I don't remember any inconsistenties in the firearms in that movie. But I did notice in "Hatfields" a guy walking around with a brass framed Remington '58. Never made back then. Wild Bill was know to carry his "51's for several years after cartridge revovlers became available. It's like some one mentioned, back then Guns were tools and if it worked you kept using it. Plus blackpowder was probably more available than cartridges, and they made their own bullets. Good show, brass framed revolvers regardless.