One more thing, with shotgun, hits are hits. Steel must fall and paper must be hit. But a -0 on paper is scored the same as a -3 and only one round per target required.
So for most people, the raw time will be their final score. About all you can get is failure to neutralize which is a miss too, so it counts as 15 points down.
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Good Shooting, MarkCO
http://www.angelfire.com/co3/markcolo/