This cartridge is a high explosive round designed to inflict personnel casualties using ground burst effect. It is fired from 40mm Grenade Launchers M79 and M203 (attached to the M16 series rifle).
The cartridge is a fixed round of ammunition consisting of a projectile body with a rotating band and a cartridge case assembly. A hollow aluminum ogive is fitted to the front of the projectile. A PD fuze with a booster charge is threaded into the opening of a steel ball assembly crimped into the projectile base. The ball assembly contains an HE bursting charge. The projectile assembly is press-fitted into the aluminum cartridge case. The case is a hollow bi chambered cylinder with a metal closing plug crimped into the cartridge case. The propellant cup assembly is sealed by the closing plug in the bottom, and contains the propelling charge. A percussion primer is crimped into a center opening in the closing plug. The propellant cup assembly acts as a high pressure chamber, and the hollow cavity in the case surrounding the cup acts as a low pressure chamber.
Filler - Composition B (32 g, 1.14 oz)
Propelling charge - M118 cartridge case, M42 FED 100 percussion primer, M9 propellant (330 mg)