Fire Form

  • The act of firing a relatively smaller cartridge in a rifle with a relatively somewhat larger chamber in order to expand the cartridge case to the larger size. This action should not be undertaken except in very particular instances or catastrophic damage may occur. It should only be done when the larger chamber is of a closely related design to that of the smaller cartridge case---such as firing a .375 H&H Magnum cartridge in a .375 Weatherby chamber, or firing a .22 Hornet cartridge in a .22  K-Hornet chamber to re-form the brass to the latter "improved" cartridges.