The full understanding of Billy Dixon's shot is that he was not aiming to hit one Indian sitting on a horse. If people read the histories correctly, and carefully, he was shooting at a group of perhaps 2 dozen Indians up on the bluff. His aim was to put a bullet close enough to them to worry them. His group resented the fact that the Indian chief thought they were safe on that knoll, and could sit up there all day long, laying seige to the " fort ". ( really a trading post.) So, Billy volunteered to see if he could not " worry them ", and borrowed a gun from the owner of the store- his gun was waiting on parts to make a repair- and he took the shot.
Of course, Billy claimed it was just luck that he hit the Indian, who later died of his wounds. The gun was a .50-90 Sharps, shooting a 550 grain bullet. Thats about 1 1/8 ounce of lead, going out at about 1250 fps. at the muzzle. Maybe less.
Mr. Dixon would have been just as happy if he had hit a horse. The effect would have been the same. The Indians did get worried about being hit at that range, decided their medicine was wrong, and broke off the seige. Billy was given credit for ending the seige( He did!) by taking a shot no onle else was willing to even try! He was later awarded the Congressional Medal of Honor for that shot. That is why you hear about the shot so often, even in the poorly distorted versions of the true history. The shot has been measured to be approx. 1683 yards, or about 7/8 of a mile. Dixon did not have any idea what the range was. All he did was hold up all the sight he had, and then some, and held off for the wind, and fired the shot. Dumb luck to hit the Indian. Particularly when he wasn't aiming at the Indian! Maybe the Indians were right about their medicine being bad! No?