As far as stock shots are concerned, BUFFALO BILL seems to be the absolute winner, at least in the western genre. Stock shots of the battle scene (War Bonnet Creek) were used by Fox in numerous productions. PONY SOLDIER with Tyrone Power (begining of the movie). SIEGE AT FEATHER RIVER (end of the movie, which was produced by Panoramic which provided FOX with B pictures). THE TIME TUNNEL TV series (Episode : Little Big Horn) also used the battle to pass as Custer's famous last stand.Another depiction of that battle, from THEY DIED WITH THEIR BOOTS ON starring Errol Flynn, was used in BUGLES IN THE AFTERNOON starring Ray Milland. Though THEY DIED was black and white, and BUGLES Technicolor, the stock shot did fit because it was being watch through binoculars by Ray Milland and modified from black and white to sepia.
If anyone knows of other stock shots in westerns, I'd be glad to read about that.