I'm sure this has been discussed on here before but I just completed sighting in my HHA DS-XL5510, I started out using the 20-40 sight in method, then the 20-60 method. During the 20-40 method I came up with a 38 tape, and during the 20-60 I came up with a 42 tape. Faced with a delema I layed the two tapes together and saw that they were nearly identical until the 45 yard mark where the 42 started to show a little length to allow for a little slower bow. I chose the 42 for the fact I shot a 4 inch group at 60Y and felt confident I couldn't do much better. So I slapped the tape on and went out to see if I had made a mistake. Boy was I surprised, I was able to dial it to the chosen yardage and it hit dead on every time, I shot six arrows from 35-60 and all were in a 3 inch group. I was truly amazed, and wished I had gone to HHA much sooner. So for anyone looking at HHA for a new sight I would strongly suggest try it sooner than later. Any how just thought I would let someone know, seems my wife just wasn't as impressed about it as I was.