My understanding, and I could be wrong, is SI is .005 choke, and SO is .015 choke, or skeet and light mod. The reason being is back when skeet was started and those designations were used, skeet was shot with " gun down " and the shots were longer than modern skeet and with fiber wads patterns were bigger. Now everyone with the gun up tries to break em by the center stake. Today I don't believe Briley has skeet out at L.M.
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Paul Harm
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