US Cartridge, 40mm HE-T, M677
This cartridge is a high explosive round containing a tracer element for flight tracking purposes designed to inflict personnel casualties in the target area from ground burst effect. It is fired from 40mm Grenade Launchers M75 and M129, and from 40mm Machine Gun Mk 19 Mod 1.
This cartridge is a fixed round of ammunition consisting of an internally embossed one piece steel projectile body with a mental rotating band, and a cartridge case assembly containing a propelling charge and a percussion primer. A PD fuze is threaded into the front end of the projectile. The projectile cavity contains a high explosive bursting charge and an RDX booster pellet seated below the fuze. A tracer element is threaded into the opening in the center of the projectile base. The projectile assembly is press-fitted into a cartridge case, The case is an aluminum bichambered cylinder with a metal closing plug crimped into the open well of the propellant chamber in the base. The propelling charge is contained in the spherical high-pressure propellant chamber. The chamber has vents in the top and is sealed in the bottom by the closing plug. The hollow chamber in the upper section of the case acts as a low pressure chamber. A percussion primer is crimped into the center opening in the closing plug.
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Collaborative Ordnance Data Repository