A pattern caused by the use of an excessive choke constriction which is sometimes detectable by the presence of a donut-shaped ring around the center of a pattern in which very few pellet impacts are counted, but where the outsides of the pattern are heavily impacted.
More generally, where successive patterning experiments have show a peak in density followed by a sharp drop in performance as choke constriction is increased, the patterns created using a tighter constriction than that which gave peak performance can be said to be “blown” – i.e. their effectiveness has been damaged by an excessive degree of choke.
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