Description
This cartridge is used in 90mm guns for spotting and screening purposes and has a limited incendiary effect.
The projectile consists of a hollow steel forging with a boat-tailed base and streamlined ogive. The projectile nose is threaded to receive an adapter for the point-detonating fuze and to provide a seat for the burster casing assembly. The burster casing assembly a thin-walled steel tube containing the burster charge and burster initiator, extends from the adapter to the rear of the projectile cavity. The burster tube provides a tight seal for the charge of White Phosphorus (WP).
The M313C is identical to the M313 except for a different propellant charge which gives a lower muzzle velocity and a resultant reduction in gun wear.
The projectile is painted gray with a yellow band and markings. Green wired markings for later manufacture.
Functioning
When the weapon is fired, the burning propellant creates gases which propel the projectile out of the gun tube. Upon impact, the point detonating fuze functions igniting the burster initiator and detonating the burster charge. The projectile casing ruptures, dispersing the filler. WP ignites upon contact with the air, producing a dense white smoke and flaming particles.
Hazardous Components
Filler - WP (1.97 lb, 0.9 kg)
Propelling charge - (M313) M15, M6 (7.31 lb, 3.32 kg) ; (M313C) M1 (5.33 lb, 2.42 kg)
Primer - M49, M28B2
Burster - M24, Tetrytol (2.33 oz, 0.07 kg)
Burster initiator - M2
Physical Data
Length, overall (M313) - 37.44 in, 951 mm
Length, overall (M313C) - 37.46 in, 951.5 mm
See Also
Source(s)
TM 9-1300-203, Artillery Ammunition (1967)
