To make matters more difficult, back in the day, the same size shot from one manufacturer would be different than another manufacturer. The pellet count for the same weight would vary. You would have to know who the shot manufacturer was, the pellet count for each barrel, and the shot weight, the size of the pattern and the distance plus the gauge to figure out the percentage. Some of the Parker catalogs had a chart of shot sizes and manufacturers. I'll try and scan it and post in but may not be for a couple of days.
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