If you look at NSSA averages for a AAA shooter the 12-20-28 are all .25% apart, the .410 is 2% lower (this is for classification not the scores). I take that to mean that over a long time with shooters of similar ability the .410 is 2% less effective but still shooting 96.5%. For the average bird hunter/recreational shooter I'm not sure that translates at all.
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