ramjet

I'm trying to find the name of a western I saw sometime in the early to mid 70's. There were several factions fighting over a gattling gun. I seem to recall a small number of cowboys, a bunch of soldiers and perhaps a Mexican army all trying to own the gun, the end of the movie is a big fight between them all. There might have been some nuns burying the dead at the very end but I might be confusing movies; it was a long time ago. Several people have suggested "The Gattling Gun" but I read a synopsis of that on imdb and it doesn't ring any bells. Any help would be most appreciated.

I saw a movie when I was younger and one scene stuck with me. I was not suppose to be watching the movie, I just happened to wake up and get a drink of water at the time, therefore I'm sure it was not a kid's movie. It was shown early in the evening on regular network TV (no cable back then) so I'm assuming it was either a very old movie for the time (pre-80's) and easily edited. This is all I remember for certain: there was a group of people on a train and people were being killed one by one. The scene I saw was of a man who was drugged or knock unconscious and placed, sitting up, next to the wheels of the train before it left the station so that the wheels would crush him as the train left. For some reason when I try to picture the guy, I think of Father Guido Sarducci from SNL.I don't know why. I'm fairly certain from the clothing, music, hairstyles and when I saw the scene on TV that it was made in the mid to late 70's. The things that stick in your brain, goodness. Please help me.