I'm using an HHA OL-5000 sight on my Outback,w/ Tru-Peep which fits the hole size of the sight almost perfect. Have it set at 20,30 and 40 yards. Love the sight but like others said you would only be major guesstimating if you only used one pin or didn't move your slide adjustment. My bow is set at 63lbs w/28"shafts and 100 grain heads and there is significant drop out to 40 yards much less 50.