and your measurements are confirmed by the factory choke markings - ithaca was one of the very few american makers who marked their guns chokes...0 was cylinder, 1 was imp cyl, 2 was modified, 3 was imp mod, and 4 was full - as marked on the forward barrel flats. not a glamorous gun, but a well made field gun that was stronger than most - i've owned and shot 12 and 10 gauges, and respect the guns.

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland