Maybe the way we measure is different.
DA brings up a valid point. I have seen studies where they determined hit ratio by dividing the total number of rounds fired by the total hits scored (I believe SOP 9 was and may be still done that way). While on the surface that seems the way to do it, it is not the most accurate. The most accurate way to do it is to look at the participants and take the number of hits/rounds per participant.