There were eras where the target was 45 yards from the gun and the circle was a different dimension (OK, I just checked, and it is a 24" circle). Somewhere, Parker Brothers told us how to convert this information into a percentage for 40 yards and a 30 inch circle. We discussed this information on this forum a while back. Also, 12 gauge guns were not only patterned with 1 1/8 ounce loads, but sometimes with 1 1/4 ounce loads.
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