Dean, what are the exact choke constrictions and bore measurements of your 28 gauge skeet gun? I also have a 28 skeet gun with no choke markings. The reason mine does not have a Skeet In and Skeet Out marking is probably because it is true cylinder bore and the skeet markings would be incorrect. I suspect the reason your 28 skeet does not have the In and Out marking would be that it is not choked Skeet In and Skeet Out, but some other combination.
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