I agree with the other posters.
However, American maker's 16g barrels are usually stout and because the angle of the forcing cone exceeds the angle of the exterior of the barrel, all the domestic 16g and 12g guns I have measured have
more wall thickness for the length of the forcing cone than at the end of the chamber. I have not had the pleasure of measuring a O frame Parker 16g or lightweight Lefever.
Probably more relevant to the removal of pits commonly found within and just past the forcing cone. Amazing what one can find with a good wall thickness gauge
