Originally Posted by StormDogOutdoors

i was going to say the same thing. just take a peice of cardboard and draw a line straight down the middle horizontally with a sharpie and stick it to your target. shoot at 5 10 15 and 20 yrds with your first pin and adjust if nessecary after 20 yrds. do the same with the 30 yrd pin but at 25 and 30 and so on and so fourth until you run out of pins. i found this technique to work pretty well IMO