Lonesome Dove
(Robert Duvall, Tommy Lee Jones, Danny Gover,
Robert Ulrich, Rick Schroder, etc) ... Always loved that movie.
I also have fond memories of those old westerns of my childhood: The Rifelman, Gunsmoke, Bonanza, Have Gun Will Travel, Wagon Train, Rawhide, The Big Valley, Branded, Wanted: Dead or Alive, The Lone Ranger, The Magnificent Seven, etc (too many to list!)