Patent ID: 8707867

Claim:
A drill cartridge having a first central axis for use in a 9 mm pistol and a .223 caliber rifle that includes a firing pin and a bolt assembly having an ejection pin and an extractor, the drill cartridge comprising: a rear casing which comprises a cylindrical segment, and a rear surface adjacent the cylindrical segment, the rear casing being configured and dimensioned such that when the drill cartridge is chambered in a .223 caliber rifle, the rear surface seats fully on the ejection pin and the cylindrical segment avoids engagement with the extractor; and a front casing with a first maximum outer dimension perpendicular to the first central axis, the front casing being connected to the rear casing such that the front and rear casings cooperate to form a housing, the housing being configured and dimensioned for chambering in a 9 mm pistol chamber and in a .223 caliber rifle chamber.