the d-i-r is a lil screwey i keep mine set on setting 2 with the horton multi-range scope 1st crosshair is 20 2nd 30 3rd 40 suits me great off the ground.I never eventried it past 40 .It worked for a buck and doe this year so something must be right. That bow and spitfires/rage 2 blades seem to be a good match.