After decades of revisionist westerns, this drama by TV veteran David Von Ancken is impressive for its stubborn classicism. Pierce Brosnan stars as a trapper in the Pacific Northwest who’s wounded by rifle fire in the opening scene and spends the rest of the movie running for his life; the posse chasing him is commanded by Liam Neeson, who’s determined to avenge the crimes Brosnan committed as a Union officer in the Civil War. This may not be traveling anywhere new–the plot recalls Budd Boetticher’s Seven Men From Now (1956), cinematographer John Toll’s romance with the horizon inevitably references John Ford, and the sun-broiled climax is lifted from Greed (1924)–but Von Ancken keeps it hurtling down the tracks. R, 115 min. a Century 12 and CineArts 6, Pipers Alley, River East 21