I've looked at that one too. It's close, but the ‘R’ is much closer in Silverado. From looking around, Silverado RR Medium is the best, but I can't find for free.

This site is super helpful, because you can actually type the word you want to see in that font. I matched Silverado against a picture of the movie's original poster:

http://new.myfonts.com/fonts/redrooster/silverado-rr/medium/