A few years ago I built a patterning stand using two 2x4s, two pieces of 3/4" plywood 12" x 30" and a couple of broom handles. I built a large "window blind" affair using a roll of 30" butchers paper spooled on the top broom handle down through an opening between the pieces of plywood spaced 30" apart and then spooled onto another broom handle at the bottom of the patterning stand. After each shot I would write shot size, load size, gauge, distance, etc. on the pattern I just shot and then I would simply roll the paper 30" or so and have another target ready for the next pattern test. If you want a back stop just use solid piece of wood behind the roll.
This way you have a physical record of your testing and a lot less messy than shooting grease or paint board. In fact you can take the roll back to the house and do pellet count , review each pattern many times and keep to show your other hunting friends. I think I paid $25 for a hundered foot roll of paper and I scrouged the rest of the materials from family members.
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