The fact that it is a 1936 says the chambers were lengthend and cones if they are long as described. I have never opened chambers, but rather had the cones lengthened. Accomplishes almost the same thing without taking possibly too much metal at the chambers end.
David; when did the Smith 16 bores get away from .650 to what? My 1931 16 has .650 bores and my 1945 .667.
