I sight in at 25-27 yards,( 0 ) make a mil dot reticule and mark where my gun hits at all distances. Just got a graph from Scott Hull,,he uses a different method. He knows the measurements of cider blocks and Gamo FT's. So using that he calculates the distance of the targets. Scott is an engineer, he built a side lever piston rifle. You should see it. Infect I think he is going to Oregon and use it in the Nationals.
Thanks for the reply.