I have a CH 12 that letters with a cylinder choke in the right barrel. It measures at .004" Interestingly, a 16 GH lettering with a cylinder choke also measures .004" I'm sure that if you could find and shoot some 1904 shells through that gun, the pattern would open up some. Modern ammo and plastic shot cups can tighten those old chokes. The patterns you have look great to me.
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“Every day I wonder how many things I am dead wrong about.”
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