cbm, dont expect that to hold true when you are outdoors and have a crosswind of say more than 12-15 mph . My old black knite would stack a fletched fieldtiped arrow , a unfletched fieldtiped arrow , a fletched arrow with a muzzy 3 blade . and a fletched arrow with a magnus 2 blade , all in the same hole , if I did my part , all at 290 fps . That was at 20 yards .