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Type Classification:

Cont OTCM 37119 dtd 1959.

Used:

This cartridge is used in 57mm recoilless rifles for target practice.

Description:

The cartridge consists of a perforated metal cartridge case, containing a plastic liner, which is crimped to a steel projectile. The cartridge case liner is loosely filled with propellant and the cartridge case is equipped with a percussion primer. The primer ignition tube extends through the length of the propelling charge. The projectile resembles the HE round M306A1 with the same shape and pre-engraved rotating band; however, instead of high explosive filler, the target practice round contains only a small black powder marking charge. The projectile is equipped with a PD fuze. This target practice round has the same ballistics as the HE round.

Functioning:

The black powder flash from the primer ignites the propelling charge when the primer is struck by the firing pin of the weapon. The burning propellant generates gases to propel the projectile through the barrel to the target. Recoil is eliminated because some gas pressure escapes through the perforated cartridge case, and then through the apertures in the rifle breech-block. The rotating band engages the barrel rifling to spin the projectile for stability in flight. Fuze detonation ignites the black powder charge in the projectile to produce flash and smoke for marking the impact point.

Tabulated Data:

Complete round:

Projectile:

Color -------------------------------- Blue or black with white markings

Filler and weight ---------------- Inert material, 6.46 oz, Black powder 1.1 oz

Components:

or M503

Performance:

TemperatureLimits:

Firing:

Storage:

Lower limit ------------------------ 80°F (for not more than 3 days)

Upper limit ------------------------ +160°F (for not more than 4 hr/day)

* Packing ----------------------------- 1 round in fiber container; 4 containers in wooden box

*Packing Box:

*NOTE: See DOD Consolidated Ammunition Catalog for complete packing data including NSN's.

Shipping and Storage Data:

Storage compatibility group ---- C

DOT designation ------------------- AMMUNITION FOR CANNON WITH SOLID PROJECTILES

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