Fred;
"I guess "fractions are applied literally" was a bit cryptic."
What you stated is essentially the old British standard. They were considered nominally full = .040", 3/4 = .030", 1/2 = .020", 1/4 = .010", I/c = .006" & cyl = .000"-.003". This was my interpretation of what you were saying. It is also worthy of note that 1MM = .03937 (approx .040") so in essence both standards are equal. All I was adding was that I believe you were correct that continental makers did not normally make guns with I/C chokes, but the British did. In this case it was in fact a slightly choked cyl, less than a 1/4 choke. American guns as well as Continental guns built for the American market are more apt to have 1/4 choke, stamped as I/C.
Miller
