Since the first thread got locked (another COVID conversation casualty) Rocketman & I have PMed specifically on the pattern efficiency question and he’s shared some excellent insight. With a green light from Dave and an OK from RM, I’ve “continued” the thread and am posting his insights.
“The real definition must include vulnerable area (in square inches) of the target, number of hits of "X" size shot to constitute a lethal dose, a predetermined distance, and a patterning plate. The "target (plate) " can capture the pattern prior to applying the "target." We are not dealing with POI. The target can include a center of one vulnerable area (X sq. in.) and each concentric circle after the center must contain eight times "X" areas divided into single "X" segments. Looks sorta like the center is an undivided pie and each ring thereafter is donut segments. You now look for the largest ring where the eight segments average a lethal dose. Count the shot inside that diameter and divide by the number of shot in the load and multiply by 100 and presto alakazam you have the efficiency. Repeat ten times and actually know something statistically reliable.”
