Short film: Bremen 130's 'Draw of the Beast'

I hope that someone can remind me of the title of what I think of as The Worst Western Movie Ever Made. I saw it about thirty or forty years ago. It was an amateur movie but was supposedly professionally released. It was supposed to be a serious Western-horror movie, not a comedy, but the audience was laughing so loud that it was hard to hear the sound track. In one scene, the cowboy hero is in someone's home (his girl friend's?), and he enters a bedroom, walks behind a bed, stiffens in horror at something on the floor that the audience can't see, pulls out his six-shooter and fires twenty or thirty shots (without reloading) at whatever it is. The other people in the house rush in, and the hero explains something like, "It was a giant rattlesnake waiting to bite you! I shot at it, but it leaped past me and escaped out the window!" In conversation with friends after the movie, we agreed that the rattlesnake must have been able to coil up and bounce like a wire spring to jump out a window. Black Magic was involved somehow, but I don't remember how.