Generally used to describe the distribution of shot from a shotgun. To pattern a shotgun, a large target is erected 40 yards from the firing line, a 30-inch circle is drawn on the target and one shot is fired. The number of pellets striking inside the 30-inch circle is recorded and divided by the total number of pellets in the load. This percentage can be used to accurately compare different loads, as it is independent of shot size, velocity etc.
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