Hour Of The Gun (1967) directed by John Sturges was an entertianing western inspired by this film list, A Tough Guy Film Fest, supplied to NPR by crime/TV writer George Pelenacos. Here's his take on the film:
Strurges' revisionist retelling of the legend of Wyatt Earp was also a shaded answer to his own, glossy Gunfight at the O.K. Corral, filmed 10 years earlier. Sturges (The Magnificent Seven, The Great Escape) was a master of hypermasculine entertainment; his preference for low angles, long master shots, vertical vistas and carefully staged gun battles further mythologized the players. Earp (James Garner), straight of posture and quick on the draw, goes from upright marshal to cold killer, his conscience prodded continually by consumptive alcoholic partner Doc Holliday (Jason Robards, for my money the best Doc screen portrayal). Their final scene together hits like a punch in the heart. With Robert Ryan as Ike Clanton and a young Jon Voight as Curly Bill Brocius. This is worth watching alone for its Jerry Goldsmith score.