I heard that's just an urban legend. Is there a screen capture of it?
My own personal movie snaig was in the movie "Zulu", where, in a couple of scenes, the British troops were using Lee Enfields (a rifle from about 40 years in the future), rather than the Martini Henry. I guess they didn't have enough of the proper rifles for all the extras.
The goof appears towards the end of the movie, where you can spot them among the extras in the rear. However, they're quite evident at the last battle scene at the "square", where some are in the foreground. You see troops firing single-shot rifles while some of them are blazing away with bolt action SMLEs.