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Gauge of a Shotgun is defined as a list include all necessary data to define a functional Barrel. For example the Dimension of the Chamber, the Shotgun bore Dimension and also the valid Proof Load and Commercial Ammunition as defined in by the C.I.P. for Greater Britain in the APPENDIX I of the: RULES, REGULATIONS AND SCALES APPLICABLE TO THE
The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
Shotguns intended for all-round hunting are a compromise, but a 72 to 74 cm (28–29 in) barrel pump-action 12-gauge shotgun with a modified choke can serve admirably for use as one gun intended for general all-round hunting of small-game such as quails, rabbits, pheasants, doves, and squirrels in semi-open wooded or farmland areas in many ...
A 12-gauge shotgun cartridge in a transparent plastic hull, allowing the contents to be seen. From left to right: brass, propellant, over-powder wad, shot wad, #8 birdshot, over-shot wad, and crimp. A shotgun cartridge, shotshell, or shell is a type of rimmed, cylindrical (straight-walled) ammunition used specifically in shotguns.
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).
Military use of combat shotguns through the 20th century has created a need for ammunition maximizing the combat effectiveness of such weapons within the limitations of international law. 12-gauge has been widely accepted as an appropriate bore diameter to provide an effective number of projectiles within an acceptable recoil.
Hence, a 12 gauge shotgun has a bore that is equivalent in diameter to a round shot of lead weighing one-twelth of a pound; a 20 gauge shotgun has a bore equivalent in diameter to a round shot of lead weighing one-twentieth of a pound, and so forth similarly sizing for 16 gauge and 10 gauge shotguns.
12 gauge United States: 1972 Baikal MP-153: Izhevsk Mechanical Plant: 12 gauge Russia: 2001 Bandayevsky RB-12: Aleksandr Bandayevsky: 12 gauge Russia: 1995 Benelli M1: Benelli Armi: 12 gauge 20 gauge Italy: 1986 Benelli M3: Benelli Armi: 12 gauge 20 gauge Italy: 1989 Benelli M1014: Benelli Armi: 12 gauge Italy: 1999 Benelli Nova: Benelli Armi ...