The Sprengpatrone or "explosive cartridge" in English was a rifle grenade that was developed by Germany and used by the Wehrmacht during World War II.
The Kampfpistole was a rifled single-shot break action gun and the cartridge was breech loaded.
The Sprengpatrone was designed to give German troops a small and lightweight grenade launcher for engaging targets from close range which could not be engaged satisfactorily by infantry weapons or artillery without endangering friendly troops.
The Sprengpatrone was used for low angle direct fire where range and accuracy were needed.
[2] This grenade consists of an aluminum cartridge case, a percussion cap in the center of the base, black powder propellant charge, an internal steel projectile filled with PETN and was topped by a nose fuze.