Seems in the dim recesses of my memory; a story about Lord Ripon; reputed to be the greatest shot gunner of the Victorian era: When asked what choke he used in his gun; he replied "Why Full and Full Sir." (Hruumph, pip, pip! dear Fellow.)
When he died, a purchaser of said gun measured the chokes and found they were Cyl-Cyl.
That story has been buried in my skull for a few years, and I can stand to be corrected if it is wrong.
I have shot side by sides with Briley choke tubes, and end up putting in Cylinder/I.C........not that I am a hot shot.
Sam Ogle, Lincoln, NE