Bone Tomahawk (2015)

After a primitive tribe abducts three people from their small town, a group of four men ride out to rescue them. There's the sheriff and his elderly deputy who do so out of duty, an injured man whose wife was one of those taken, and a bachelor braggart with the most killing experience. The enemy's location and customs are a mystery to the rescue party and the journey seems to get more difficult by the hour. Yet, they persevere. 

This may not be the most graphically brutal movie I've ever seen, but it's definitely close. The barbarity, however, felt earned rather than "let's see how disgusting we can be."

B