Recently we watched a TV series called Godless. It went on for quite a few episodes as a Western taking place in the 1880s. The opening of the program showed a nice over under breech loader with ejectors, which probably could not have come from at least 30-40 years later. They also hunted ringneck pheasants, which as I recall were not in the U.S. at that time.

http://www.bakercollectors.com/