I am giving shooting instructions to a young Marine Recruit who is on the deferred enlistment program and is scheduled to leave for "boot camp" at the last of August. He had never shot before. He and I were at the range for our weekly shoot and practice (He has progressed from a beginning group size of about 14" down to an average group size of 2 1/2 to 3")(10 shot groups at 100 yds with open sights) and my buddy was shooting while I was watching through the spotting scope. After 4 shots, as I was looking at the shot group, a horsefly landed right in the middle of the shot group. Of course my buddy couldn't see it with open sights at 100 yards. As I was watching the horsefly, the next shot was fired and a bullet hole appeared WHERE THE HORSEFLY WAS PERCHED. No more horsefly. I started laughing so loud that my buddy stopped shooting and was wondering what I was laughing about. I told him that he was probably the only marksman who could actually say that he had shot a horsefly at a distance of 100 yards with open sights.