My earliest Fox 20-gauge left North 18th Street and Windrim Avenue in 1913 bored full and full. It was the gun of an Annapolis, Maryland quail hunter and the chokes were opened to .004" and .016" by the time I got it when it was 79 years old. Those chokes work great for me and it is the Fox 20-gauge I shoot the most --
My other 20-gauge Fox doubles are .031" both sides on a 1920-vintage 30-inch gun, .027" and .032" on a 1927-vintage 28-inch gun, and .009" and .020" on a 1938-vintage 26-inch gun that has full and full crossed out on the production card.
The most choke I have in a 20-gauge gun is a 1933-vintage 4E NID with 30-inch vent rib barrels with .038" right and .042" left. Interestingly there are no choke markings on the barrel flats of that gun, and I've seen a handful of other long barrel Ithaca 20-gauges of that vintage without choke markings?!?
I have a little 0-frame Parker Bros. 26-inch 20-gauge of November 1930 vintage, still chambered for 2 1/2 inch shells, with .022" right and .028" left. Way too much choke for skeet or Quail.
The old timers liked plenty of choke in their smallbores.
