The scene in "Last of the Mohicans" when Fort William Henry was under siege by the French and their Indian allies; Colonel Munro needed to get a message to General Webb at Fort Edward. The only way was for a fast runner to hand carry a message through the siege lines. Someone was selected, he took the message in a pouch and set out running through the forest, on a path that kept him in view from the wall of the fort. As indians allied to the French stepped out to stop him, Hawkeye and his partners on the wall of the fort took them out with careful rifle fire, one at a time. When the messenger was almost clear of the lines and a good distance from the fort, an Indian ran out behind him, tomahawk poised. Hawkeye had loaded his long rifle using a silk patch for greater distance (so he said); he took careful aim, the lock fired, the rifle barked, and shortly the ball went clear through the Indian. They edited that scene to convey the drama of such a long shot, pausing on Hawkeye as he concentrated on his aim, closeup on the lock as it fired, and the bloody hole in the ambusher as the ball went through him.
The scene in "Lonesome Dove" when Augustus McCrae, who is being pursued by BGs across an arid, open plain, shoots his horse for shelter and begins a standoff with his pursuers. He purposely aims his Henry 1860 rifle so the bullets hit the ground in front of the bad guys, leading them to believe they are just out of his range. When the leader, confident he was out of range, stands up and makes derisive gestures like a chicken toward McCrae, McCrae flips up the ladder sight, adjusts it for range, takes aim and gut-shoots him, surprise, surprise!