Abstract

The method comprises one or more of the following steps: ?? a) defining an expansion chamber having a length comprised between 5 and 15 cm and an inner diameter greater by 0.3 ÷ 1 mm than the inner diameter of the bore of the barrel of the shotgun; ??b) providing a tubular choke tube, wherein at least a portion of the choke tube has a length comprised in the range of 5 - 15 cm and an inner diameter greater than the inner diameter of the bore of the barrel by 0.3 ÷ 1; ??c) arranging a plastic sheath outside of the cartridge having a thickness corresponding to the difference between the cartridge and the barrel caliber; ??d) providing a cartridge having a caliber corresponding to the caliber of the barrel of the gun, the cartridge comprising a case inner base, a case head and a containing tube for the shots, and providing the case inner base of the cartridge with a tubular extension, integral with the case inner base itself, wherein said tubular extension is coaxial relative to the containing tube of the cartridge and it extends therein.

IPC Classes  ?

• F41A 21/28 - Gas-expansion chambersBarrels provided with gas-relieving ports
• F41A 21/16 - Barrels or gun tubes characterised by the shape of the bore
• F41A 21/40 - Chokes for shotguns
• F42B 7/02 - Cartridges, i.e. cases with propellant charge and missile
• F42B 5/02 - Cartridges, i.e. cases with propellant charge and missile
• F42B 5/285 - Cartridge cases of metal formed by assembling several elements