Point of impact only, because like snowflakes no two shells are exactly alike ... One pattern might have a hole in it that does not exist in another one or if one does exist, it would be in a different place in the pattern ... Unless each and every shell were completely and exactly alike there is no use to pattern a gun for anything other than POI ... I can look at the hot spot in tha pattern at the same time and go from there ... WPT ... (YAC) ...