Favorite is The Good, The Bad, and The Ugly - three guys, none of which like one another, all know part of a clue pertaining to where a fortune has been buried. They cooperate with, backstab, double-cross, torture, and ultimately have a three-way stand off with one another as they attempt to get the pieces of info they are missing from the others.
Be on your guard. There are older and fouler things than Orcs in the deep places of the world.
Not just "blazin guns, no speakums".
You might look into "The Ox Bow Incident." I think it was a movie as well, but I've only read the book. Really more of a study of human nature, which happens to be set in the Old West, than a "Western."