1/4" at 25yrds= 1MOA, 1/2" at 50yrds= 1MOA, .75" at 75yrds= 1MOA....you get the idea. Zeroing rifles with 1/4" graph paper at 25yds is remarkably easy. Counting cubes and making clicks accordingly saves ammo and time, and gets newbs on paper at 100 quick.