This web page will give you a fairly decent chart of the ranges of constriction for the various choke names. The difference between these two measurements will give you the picture of the true choke constriction. Note: Add 30 for solid or ventilated rib to listed values. Produced under license from Fabrique Nationale. The way to measure the choke correctly is to measure the inside diameter of the bore 4 inches behind the muzzle, and at the muzzle. 12-, 16- or 20-gauge semi-automatic shotgun, with barrels ranging in length from 26' to 32'. The old adage of using a dime to check to see if it is a full choke really won't work that well, there is just too much allowable variance in the dimensions, and you often find that two shotguns of the same make and model with consecutive serial numbers, both stamped with the same fixed choke size on the barrel, will be at different diameters at the muzzle. 740" ID, that "Full Choke" barrel before it was cut could have measured from as tight as. Since 12 gauge guns have nominal bore sizes that range (by manufacturer and country) from. There is an allowable range for the constriction, and it would be applied to the nominal bore size of the gun. If your barrel is marked "Full" then it left the factory with a full choke, which is a constriction of between. Remington cease production of the Model 11 in 1948, they did make them during WWII, but pretty much all those went to Uncle Sam. If it were a Model 11 that was made after 1920 and it had left the factory as a riot gun, the model number on the left side would say "Model 11R", it would have a 4 shot magazine and a 20 inch barrel, and the barrel would be stamped "Cylinder Bore" on the left side back near the receiver. Louis, MO with the choke size on the same line of stamping, and the words "Special Steel" on the next line, and then the words "Guage 2-3/4 in." or "Guage 3in." on the next line. The ones manufactured between 19 will have a engraved portrait of John Browning on the left side of the receiver (The Remington Model 11 is JMB's A5 design licensed to Remington) and the barrel on these, if the original, would be marked " Browning Arms Company, St. To the best of my knowledge, all the Remington Model 11 Riot guns left the factory with 20 inch barrels with cylinder bore chokes, and the barrels were marked "Cylinder" or "Cyl.".
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