CARTRIDGE 23 MM SCHILKA AP/IT
GENERAL :
This is an anti-air ammunition. It is a complete round consisting of case cartridge, cap (Detonating Fuze NR-3), propellant charge, projectile (Shell) like other ammunition. Details of the components are as follows:
CASE CARTRIDGE :
The case cartridge, made of steel, is rimless but belted type, the length of cartridge case is approx 151.8 mm. It has got a pocket at the base to house a cap (Primer). This pocket is connected to the interior of the case by only one central fire hole. Case is having a base dia of 33.29 mm and flange of width 3 mm followed by extractor groove of width 5 mm. After extractor groove, case is slightly tapered to form a shoulder after which the taper is slightly increased to form a neck with parallel walls. The shell is fixed to the cartridge case by indenting and coning.
CAP ( DETONATING FUZE NR-3 ):
Mass of filling from Cap 0.29 gms
Percentage of Composition
Lead ferrocyanide 45.0%
Potassium perchlorate 55.0%
Nitrocellulose 2.3%
Celophene 2.0%
 
PROPELLANT :
The propellant charge used is single base heptatubular graphited propellant having mass of 78 gms (approx).
SHELL API :
Shell comprises of body, driving band, tracer, incendiary charge (igniting charge) and ballistic cap.

Driving bands are fitted to the body. At lower portion of the body below the driving band 2 grooves are formed to facilitate fixing of the cartridge case. The shell is flat headed and is having 2 tiers of grooves and knurling for better fixing of ballistic cap. Body is recessed at the base to accommodate tracer composition having a mass of 2.62 gms. Incendiary charge (Igniting charge) is placed over the flat head portion of the armour piercing body. Ballistic cap is having a streamlined shape.
PHYSICAL CHARACTERISTICS :
Length of Complete Round 236.00 mm
Mass of Complete Round 450.00 gms
Mass of projectile 190.00 gms
Mass of Propellant 78.00 gms
Explosive filling in Cap (Primer) 0.24 gms
Explosive filling in Tracer 2.62 gms
Explosive filling in Fuze 1.25 gms
Explosive filling in Shell 13.00 gms
 
PERFORMANCE CHARACTERISTICS :
Maximum Muzzle Velocity 970 m/s
Range (Effective Range)
a) For Air Target 200 m to 2500 m upto a height of 1500 m for targets at speeds upto 450 m/s
b) For Ground Target 2000 m
 
QUALITY :
Strict quality measures are adopted during various stages of production. Finished components and all materials before manufacturing of the components are submitted to the Quality checks by personnel as per the control points mutually decided. There is also sanctioning proof of major components as per the proof schedule by the Quality Assurance department before accepting the bulk lot.
SAFETY :
This ammunition is quite safe during handling, storage and transportation.
RELIABILITY :
Due to its sound design and the manufacture, the ammunition is quite reliable to use.
SHELF LIFE :
The shelf life of the ammunition is 5 years.
PACKING :
The rounds are packed in steel Box H2A/L with packing fitments. 25 cartridges are packed in one box. The rows are separated by paper waxed. 4 such boxes are packed in each carrier 6A/L.
STOWAGE DIMENSIONS :
Av. Weight of each box 15 Kgs
Av. Weight of each carrier 66 Kgs
 
HAZARD CLASSIFICATION :
Cartridge is classified in
Compatibility group C
Hazard division 1.2
Fire fighting classification 2
Contact :

Marketing & Export Division
Ordnance Factory Board
Ayudh Bhawan
Government of India
Ministry of Defence
10A, S. K. Bose Road, Kolkata – 700 001, India.

Tel: 0091-33-2248 9027 / 2248 2103 / 2248 5077-80
Fax : 0091-33-2248 1748/2210 8235
Mail : ofbtrade@dataone.in
www.ofb.gov.in