Another vote for the "Outlaw Josie Wales." Specifically the scene where he frees the "Jayhawks" and the Indian from the Comancheros. I'd like to give an honorable mention to the shoot-out at the end of "True Grit" where Rooster faces down Ned Pepper and his gang. I know it's Hollywierd but I like those two because I know how hard it is to shoot accurately from a moving horse.
A man can never have too much red wine, too many books, or too much ammunition.