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Most shotgun cartridges are measured in terms of shotgun gauge. Shotgun gauge is determined by the weight of a round lead ball that is sized to fit into its barrel. For example, the barrel of a 12-gauge shotgun is equal to the diameter of a 1/12 of a pound lead ball (0.729 in) and a 20-gauge can fit a 1/20 pound lead ball (0.615 in).
A common method of expressing the amount of constriction is by "points". A "point" is equivalent to 0.025 mm (0.001 in) of constriction of the inner diameter of a choke. Hence, 40 points of constriction would correspond to a constriction of 0.040 inch (≈ 1 mm) in the inner diameter of a choke, corresponding to "Extra Full".
Muzzles of shotgun barrels with different shapes of chokes. A: no choke, cylindrical, zylindrische Laufbohrung (ohne Choke) B: improved cylinder, verbesserte Zylinderbohrung
The original model produced from 1947-1948. It had a plain one-piece pistol grip stock. The gun was distributed with two choke tubes (modified and full), which mount by screwing to the outside of the barrel, as opposed to the inside, like the Remington 870 or other modern shotguns. The shotgun was shipped with a wrench for removing the choke ...
While shotgun bores can be expressed in calibers (the .410 bore shotgun is measured as .410 in (10.4 mm) in diameter, [12] unlike with rifles the actual bore diameter of a smoothbore shotgun varies significantly down the length of the barrel, with the use of chokes and back-boring.
The standard model SPR100 has a blued receiver, hardwood stock and fore-end, and a fixed choke. It is chambered in 12 gauge with a 28-inch barrel, or in 20 gauge or .410 bore with a 26-inch barrel. It weighs 6 + 1 / 2 pounds. An upgraded version of the SPR100 has a nickel-plated receiver, walnut stock and fore-end, and screw-in choke tubes.
The choke typically consists of a conical section that smoothly tapers from the bore diameter down to the choke diameter, followed by a cylindrical section of the choke diameter. Briley Manufacturing, a maker of interchangeable shotgun chokes, uses a conical portion about three times the bore diameter in length, so the shot is gradually ...
The Savage Model 242 is virtually identical to the Model 24, except that both barrels are chambered for .410 bore 3" Magnum with full chokes. These guns were manufactured between 1977 and 1981. [7] Like all later Model 24s, it uses a single trigger and single exposed hammer with a barrel selector lever incorporated into the hammer. [7]