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US Cartridge, 40mm HE, M397

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This cartridge is a high explosive round designed to inflict personnel casualties using air burst effect, an fired from 40mm Grenade Launchers M79 and M203 (attached to the M16 series rifle).

The cartridge is a fixed round consisting of an aluminum projectile body with rotating band press-fitted into a cartridge case containing a propelling charge and percussion primer. A hollow steel ball assembly containing the HE charge and a delay detonator is fitted into the rear of the projectile. A PD fuze with a separation charge is threaded into a well on the front side of the ball. The cartridge case is a bichambered aluminum cylinder with an annealed brass cup pressed into the center of the base. The cup contains the propelling charge and the percussion primer extends into the center of the charge. The cup constitutes a high pressure chamber, and the hollow cavity in the case surrounding the cup acts as a low pressure chamber.

Hazardous Components

Filler - Octol (32 g, 1.14 oz)

Propelling charge - M118 cartridge case, M42 FED 100 percussion primer, M9 propellant (330 mg)

See Also

Cartridge, 40mm HE, M397E1


TM 43-0001-28, Artillery Ammunition (chg 11, 2003)