M625A1 AND M625 CARTRIDGE, 152-MILLIMETER: CANISTER,
These canister cartridges are used in 152-mm gun-launchers and are intended primarily for antipersonnel use at close range. The cartridges are effective in dense foliage. Because they are flammable, unprotected cartridge cases, those from which barrier bags have been removed can be ignited accidenally by burning cigarettes, smoldering residue, embers, open flame, etc. Do not remove ballistic protective cover until round is removed from stowage rack for firing. Do not remove barrier bag until round is being chambered. Neoprene barrier bags may be difficult to remove at -25°F or below. Overhead firing of canister cartridge is prohibited. Do not use probe adapter when firing rounds assembled with Cartridge Case M205.
The canister-type projectile for M625 and M625A1 cartridges consists of an aluminum base and body threaded together. Four axial grooves, 90 degrees apart, extend from the forward end of the body for approximately 3/4 of its length. The body contains steel flechettes loaded in five separate bays. The bay assemblies are secured by a closing cup crimped over the forward end of the body. A bleed hole in the base of the projectile allows propellant gases to build up internal pressure in the body to facilitate breakup. The cartridge case is a two-piece assembly of base and body made of high-density felt nitrocellulose, inert fibers, and resin. The cylindrical body of the M205 case containing a bagged propelling charge is attached to the projectile by a steel mounting ring and aluminum locking ring. The base houses the electrical ignition element and is cemented to the body with a special nitrocellulose lacquer.
Electrical current from the firing mechanism of the weapon initiates the ignition element/ initiator. The resultant flash ignites the propellant and the burning propellant generates gases that force the canister projectile from the gun tube. Immediately after the projectile leaves the gun tube, centrifugal force and internal pressure from the propellant gases split the canister at grooves releasing the flechettes. The flechettes disperse forward in a conical pattern as a result of the combination of forward and centrifugal forces. Canister M625A1 and M625 are identical except for the cartridge case, which is more vulnerable to fracture on impact in M625. M625 has a different ignition element and the method of attachment of the cartridge case to the projectile is not the same.
Tabulated Data: Complete round: Type ------------------------------- Canister Weight ---------------------------- 48.5 lb Length ---------------------------- 19.2 in. Cannon used with ------------- M81 series, M162 Projectile: Body material ------------------ Aluminum Color ------------------------------ Olive drab w/white diamonds and white marking Filler and weight -------------- Flechettes- 10,000, 15.2 lb Components: M625A1 M625 Cartridge case ------------ M205 M157 Propelling charge ------ Electrical M91 Primer --------------------- Performance: Maximum effective range -- 400 m Muzzle velocity ---------------- 2,260 fp Temperature Limits: Firing: Lower limit ---------------------- -40°F Upper limit ---------------------- +125°F Storage: Lower limit ---------------------- -80°F (for period not more than 3 days) Upper limit ---------------------- + 160°F (for period not more than 4 hr/day) *Packing ---------------------------- 1 cartridge per fiber container; 1 container per wooden box *Packing Box: Weight ---------------------------- 97.5 lb Dimensions --------------------- 39-1/2 x 12-1/2 x 13-3/16 in. Cube ------------------------------- 4.0 cu ft *NOTE: See DOD Consolidated Ammunition Catalog for complete packing data including NSN?s. Shipping and Storage Data: UNO serial number ------------- 0242 DOD hazard class --------------- 1.3 Storage compatibility ----------- E DOT shipping class -------------- B DOT designation ----------------- AMMUNITION FOR CANNON WITH SOLID PROJECTILE DODAC ----------------------------- 1320-D390 Drawing number ----------------- 9219469, (M625); 9257471, (M625A1)
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