The paper plate method with a 1' circle (or oblong sorta thingy) has worked for me for years. I put them up at 50, 100, 200 and 300 yds. If I can hit or knick the plate I am satisfied. I am usually exactly where I want to be from 50-200 in or near the circle. Further out is where I start to call knicks good but then I am not going to shoot at anything that far where I hunt. Ever.