According to a sticky post on 16ga.com, bore diameters vary by manufacturer with several listed.
My Dickinson Estate SxS measures .6675, Citori Invector barrels were said to measure .667
My choke tubes are a bit tight, but give nice patterns. Just close to one notch tighter than marked.
My tubes , Listed as General standard
Cylinder-.005 , 000-.001
IC- .011, .007
Mod-.0185 , .015
IM- .027, .020
F-.0345, .028
My Dickinson Estate SxS measures .6675, Citori Invector barrels were said to measure .667
My choke tubes are a bit tight, but give nice patterns. Just close to one notch tighter than marked.
My tubes , Listed as General standard
Cylinder-.005 , 000-.001
IC- .011, .007
Mod-.0185 , .015
IM- .027, .020
F-.0345, .028
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