This video demonstrates that your standard 9mm round remains deadly out to at least 440 yards (quarter mile), "Certainly further than you can aim it."
Even at 440 yards, the 9mm penetrated 3/4" plywood and the 2x4 post holding it, as well as at least 9" of ballistics gel.
Good things to keep in mind, not only if you need to take a distant shot (consider using a rest!) , as well for reasons of backstop safety!
