I have a Horton HD150 with a single red dot. I did what they said and sighted it in on 0 for 20 yards, clicked to 1 and was dead on at 30, went to 2 and hit bulls all day at 40. That is my self set limit for range with this set up as travel time and shot noise are a concern, bow is silenced as much as possible. I can see the red dot move when I change settings, the entire base shifts slightly. Sorry I can't help more. I have not had the chance to use the sight on any range but 1 in the field to kill my first xbow deer but I do have a range finder to get ranges of markers out from my stands. This is what it would be good for.