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Basically The Descent, but set in the Wild West.
http://www.upcominghorrormovies.com/movie/bone-tomahawkAfter an outlaw unknowingly leads a band of cannibalistic Troglodytes into the peaceful western town of Bright Hope, the monsters kidnap several settlers, including the wife of a faithful rancher. Despite his injured leg, the rancher joins a small rescue party with the sheriff, his aging deputy and the strong-willed gunslinger and they start a journey into the hell to descend the unknown territories of darkness where savage beasts armed with the ultimate weapon leave you no hope.
If it wasn't for the cast I'd say this would be a waste, but I'm actually kinda curious how it turns out