I have shot a single pin for about 10 years now my top pin is set at 27 yards it is the only pin i hunt with i have a 40 yard pin and a 80 yard pin on my site that i practice with i aim low heart shot on all the deer i shoot at 27 yards and closer dead deer, 28 and out clean miss. Use a 6 inch paper plate put a dot on the bottom of the plate start at 3 yards and aim at the dot using your 20 yard pin walk back several yards and using the same pin shoot at the dot do this until you shoot below the dot adjust your pin so that at no time will you shoot above the plate before you shoot below the dot i have a friend that i set up this way and he shoot a single pin out to 35 yards also you will find that you will hit close to dead on at 3 yards and shoot you highest around the 18 to 20 yard mark