I've made my own target's for a long time. Normally I also put 1" sq's on them and then a 2" black diamond in the center. Thing I found out with target's, the smaller the bull, the better I shoot so long as I can see the bull. I use 8 1/2x11 plane paper, draw one then for $.10 copy then at the Bi Mart in town. The squares come out 3/4" for some reason. Recently I was hit with a brain storm about my target's, better if the grid is smaller. So, I got some graph paper, 1/4" squares and made a target in it. Same diamond for a aiming point and room to move the bullet up 4" which generally give's me plenty of height. On the grid I draw a one inch grid using a dark pen and ruler following the lines already there. Load data can be written on the bottom or on the back, back is normal line's no graph.