I had an NID Magnum-Ten and its bore diameters were .778" right and .777" left, with .043" right and .041" left. I never used the gun, as at 11 pounds 3.9 ounces it was too much for me. I still have an NID Super-Ten and its bores are .789" right and .790" left. I believe some previous owner opened the left barrel as it has only .027" choke while the right has .053". I've never patterned it so can't really say. My 1928-vintage, factory 3-inch chambered, Super-Fox is bored just as Askins describes in his 1929 book, Modern Shotguns and Loads. Back in my youth, when I would do things as painful as shooting and counting patterns, it would go 85% with 1 5/8 ounce loads of either #4s or #5s. 1 7/8 ounce loads blew the patterns all to he!!. The production card for my gun has the pattern counts on the back of the card showing it went 79% at the factory with the 1 3/8 ounce load of #4s. Truth be told, I've shot a lot more Ducks with its extra set of 28-inch barrels bored 1/4 and 3/4.
