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At the Shoot-Off at the 2018 Shotgun World Shoot, U.S. shooter Scott Greene and Russian Roman Anikin both fired their last shots almost simultaneously, but Greene had chosen a more constricted barrel choke. This gave a tighter shot pattern and a greater risk of missing, but ultimately led to his target falling faster to win the Shoot-Off.
The barrel of a shotgun is choked to deliver a wider or narrower scattering, depending on the expected use. Shooting at close range indicates a cylinder bore barrel to deliver a wide grouping, while for hunting at longer distances such as 50 yards or meters, a choke is recommended to constrict the scattering for a tighter pattern. [3]
Consequently, the effective range of a shotgun is increased with a tighter choke, as the shot column is held tighter over longer ranges. Hunters or target shooters can install several types of chokes, on guns having selectable chokes, depending on the range at which their intended targets will be located.
Shot spreaders or diffusion chokes work opposite of normal chokes—they are designed to spread the shot more than a cylinder bore, generating wider patterns for very short range use. A number of recent spreader chokes, such as the Briley "Diffusion" line, actually use rifling in the choke to spin the shot slightly, creating a wider spread.
Having two barrels lets the shooter use a more open choke for near targets, and a tighter choke for distant targets, [6] providing the optimal shot pattern for each distance. The disadvantage lies in the fact that the barrels of a double-barreled shotgun, whether over-and-under or side-by-side, are not parallel, but slightly angled, [ citation ...
Skeet chokes are designed to produce a 30 inch shot pattern at 21 yards. Alternatively, a sporting gun or a trap gun is sometimes used. These have longer barrels (up to 34 inches) and tighter choke. Many shooters of American skeet and other national versions use semi-automatic shotguns and break-open over-and-under shotguns.
The final bore is the FABARM choke system which consists of standard choking followed by a cylinder profile at the muzzle which serves to improve shot patterns and distribution. [3] The muzzle is threaded to accept one of five different chokes or a muzzle brake/compensator. Some models were sold with a ventilated barrel shroud.
The UTAS UTS-15 is a 12 gauge pump-action shotgun with two 7-round magazine tubes that can feed in an alternating or selecting pattern. The UTS-15 has a 28.3" overall length with an 18.5" barrel, chambered for 2½", 2¾", and 3" magnum ammunition.