| 摘要 |
A wad which is adapted to be located in a case of a shotgun cartridge containing gunpowder, comprising a cylindrical wad body having an axial center hole and axial explosive gas passages, and a disc plate which has a plunger fitted in the center hole of the wad body and which has blades connected thereto to carry a mass of pellets and to transmit a rotational motion of the wad to the pellets, said wad body and disc plate defining therebetween explosive gas passages extending in directions perpendicular to the axis of the cylindrical body, so as to rotate the wad about the axis of the cylindrical body by the explosive gas, which is produced by the explosion of the gunpowder when the wad body comes into contact with the disc plate under explosive pressure.
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