Practice from farther back. sight in your pin at 40 yds, make a mark on ablank piece of tape at your pointer. Then step back to 60 yards and adjust your slider until you hit good, make a second mark. hold up various tapes until you find one that matches your 40 and 60 marks. Greater distances will make the change in tapes more evident. When i went back to shoot at 80 yards, i changed the tape again slightly.