Blackwater Gulch is a miniatures ruleset currently in development by Bleeding Ear Games. Right now they’re looking for people to help playtest the rules, and smooth things out.
The game is set in the Wild West of the late 1800’s. Each player has a team of 5 – 10 minis, and plays through story-driven scenarios.
There’s not too much more information about the game right now, but they do provide a great list of places to get some wild west miniatures to use.