US Cartridge, 75mm HE, M309, M309A1
This cartridge is fired from 75mm recoilless rifles and is used for blast, fragmentation, and mining effects.
The cartridge consists of a perforated metal cartridge case crimped to a hollow steel projectile. The cartridge case contains a plastic liner which is filled loosely with propellant. An igniter charge is positioned on top of the propellant. A percussion primer is fitted in the base, with an igniter tube extending through the propelling charge. The projectile is fitted with either a point detonating or mechanical time, superquick fuze in the nose, and is filled with TNT. The rotating band near the base is pre engraved to match the bore rifling of the weapon. A bourrelet at the rear of the ogive and another forward of the rotating band are provided as bearing in the rifle bore.
M309 has a paper-lined cartridge case, and does not have the igniter charge on top of the propelling charge.
Nothing else to see.
Collaborative Ordnance Data Repository