I do it somewhat different. I pretty much stick to the theory . . "on at 50,on at 150". Depending on the chambering and/or bullet fired at what speed . . "on at 200".
Using a 10" pie plate,I zero for center at 50yds. Then start moving back 50yds at a time. At first,holding on center of plate. Then at the distance that my hits start getting at the bottom of the plate,start holding on the top of the plate.
Holding top of plate see how far away you can still hit the plate. Keep careful notes. Change the plate often. Write on plates your distances and circle your hits.
Paper plates are cheap and when you get back home you can make a chart to tape to the stock of your gun.
As a guide in Maine,hunting moose,deer,or bear,I would take my sports to the "range" and determine at what distance they could still put hits on a plate. That is the MAX distance that I would allow them to take a shot at a game animal.
But speaking of Nikon Scopes . . . I got my first scope that had the reticle in the FIRST FOCAL PLANE. I am starting to like these scopes. Not so much for rangeing,but for the fact of being able to change the size of your reticle.
I know . . . HUH ? . . . but works great for me. --- SAWMAN