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My trusty EH has constrictions of .030" and .032". I've never patterened it to determine the actual choke. It seems to shoot tight enough using Nice Shot.
Most of the dozen or so Parker 10 gauges which I have measured have constrictions near .030". I think the tightest Parker 10 gauge constriction which I've measured is .035". I do however have a couple LC Smith 10's with .050" constrictions with unmolested bores of .775".
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