Abstract: A cartridge includes a cartridge case having a shell having a first end portion, a second end portion opposite the first end portion and a cylindrical body extending from the first end portion to the second end portion. A reinforcing cap includes a base, a sidewall extending from the base and surrounding the first end portion such that the first edge of the shell abuts an inner face of the base, and a projection extending from the inner face. A ring is pressed against the inner face and forms an air-tight seal between the projection, the inner face, the ring, and the first end portion of the shell. A plurality of indentations form protrusions in the sidewall and the first end portion for interlocking the reinforcing cap to the shell and retaining the ring against the inner face of the base.

Abstract: Cartridges and cartridge cases adapted to be chambered in weapon systems are provided. In one example, a cartridge case includes a front shell having a case base end portion, a case body portion extending forward from the case base end portion towards a case mouth portion that is configured for holding a projectile. The case base end portion has a first interlocking feature. A reinforcing cap is disposed adjacent to the case base end portion on a side opposite the internal volume. The reinforcing cap has an annular extraction groove, a primer pocket, a flash hole for providing fluid communication between the primer pocket and the internal volume, and a second interlocking feature that engages the first interlocking feature to couple the reinforcing cap to the case base end portion.