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A choke is designed to alter or shape the distribution of the shot as it leaves the firearm. For shooting most game birds and clay pigeons, a desirable pattern is one that is as large as possible while being dense enough to ensure multiple hits on the target, at a particular range.
The customer's instructions described a choke, but did not give any details on the size or shape, or how it was to be obtained. Hence, W.W. Greener had to conduct many experiments to determine the perfect shape and size of a choke for a given bore. After that, he developed tools to produce the choke bore profile correctly and smoothly.
The DP-12 is a bullpup 12-gauge pump action double-barreled shotgun designed by Standard Manufacturing.It has two tube magazines, each of which feeds its own barrel.Each magazine tube can hold up to seven 2.75-inch (70 mm) 12-gauge shotshells or six 3-inch (76 mm) shotgun shells; [1] 16 (2 + 3 ⁄ 4") or 14 (3") in total with indicator windows.
Some newer 12 gauge and 20 gauge Citori models have back-bored barrels. These are barrels with slightly larger bore diameters. Their purpose is to improve shot patterns by reducing the friction of the shot charge on the barrel wall, while also reducing felt recoil. Models with back-bored barrels use Invector Plus choke tubes.
In 1971, it was offered with the option of the Winchoke screw in choke tube system, supplied with a set of three tubes in improved cylinder (IC), modified (M) and full (F) choke. [15] [f] In 1973, 16-gauge was dropped from the production line. [15] With introduction of the Model 1300, a 3-inch (76 mm) chamber was made standard. [20]
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For example, a shotgun is called "12-gauge" because a lead sphere that just fits the inside diameter of the barrel weighs 1 ⁄ 12 pound (38 g). This measurement comes from the time when early cannons were designated in a similar manner—a "12 pounder" would be a cannon that fired a 12-pound (5.4 kg) cannonball; inversely, an individual "12 ...
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