My recommendation is build a few targets of the same size, like head size, which shouldn't be hard, just use regular paper and print out a head. Walk out 50, 100, 150, 200, 250 and finally 300ft. Put a target at each distance. Now with your scope, put each target on your crosshair, and check the distance between your crosshair and the next dot down on your elevation dots. You'll notice that the closer you are, the more dots there are between the center of your crosshair and your elevation dots. You can use this theory on the field. If you are aiming at someones head, you can tell how far they are away by how many dots between the crosshair and the elevation dots are used.
Every word ever written will fall short, of it's intent
Even sung, or spoke, or screamed, they will betray what they had meant.