Magnificent 7? Anyone?
In The Magnificent Seven (Yul Brynner, Charles Bronson, et al). The tactical preparations in the town getting ready for the banditos, then the actual fight.
The opening "gunfight" in Silverado, shooting through walls and the roof of the shack while only guessing at where your adversary is.
Willie Nelson in Barbarosa as the title character when he shoots the first of his inlaws (on-screen), all out to kill him. He stands his ground and waits until his attacker is within (his) range and dispatches him with a single shot. While it is unrealistic for Barbarosa to have stood still, waiting to shoot until sure of a good shot seemed to me a good tactic given his knowledge of his adversary.
Lost Sheep