12.7x108mmLarge Calibre Rounds

Mission

12.7x108mm rounds are designed for the DShK, NSV (NSVT), Kord, A-12.7A heavy machine guns and OSV-96 and KSVK sniper rifles. There are several modifications of rounds for various purposes. General description

The BS round with an armourpiercing/incendiary bullet (7BZ-1) is designed to engage light armoured targets, personnel and weapon systems behind light covers, as well as low-flying aircraft. It can also be used to set targets on fire. The bullet is painted red with a black tip.

The BZT-44 round with an armour-piercing/ incendiary/tracer bullet (57-BZT-542) and the BZT-44M round with a modernised armourpiercing/incendiary/tracer bullet (57-BZT542M) are designed for fire adjustment and target designation. They can be employed to set targets on fire. The bullet has a violet-red tip.

The B-32 round with an armourpiercing/incendiary bullet (57-BZ-542) is designed to defeat light armoured targets, personnel and weapon systems behind light covers, as well as low-flying targets. The bullet has a black-red tip.

The 1SL two-bullet round (index 9-A-4012) is designed to kill personnel, unarmoured vehicles and firing assets. It is fired from the YakB-12.7 high-rate-of-fire machine guns mounted on the Mi-24 gunships. The bullet has no distinguishing colour.

The 1SLT two-bullet round with a tracer bullet (9-A-4427) is designed for fire adjustment and target designation, as well as engagement of live targets, soft-skinned materiel and weapon systems. It is fired from the YakB-12.7 high-rate-of-fire machine guns mounted on the Mi-24 helicopters. The bullet has a green tip.

The 7Kh1 blank round is designed to imitate shot sound. A special blank firing system consisting of a muzzle attachment cap and special inserts in the machine gun receiver and round case is used to fire the rounds.

The 7Kh2 drill round is designed to train personnel to charge belts and load weapons. The bullet has no distinguishing colour. In order to distinguish between drill and live rounds, cases of the former have longitudinal extrusions. The bullet firmly sits in the case due to additional reduction of the case mouth. Large Calibre Rounds

Basic specifications

Designation BS BZT-44 B-32 1SL 1SLT 7Kh1 7Kh2 (BZT-44M)* Calibre, mm 12.7x108 Weight, g: round 141 128 133.5 145 142 80.1 115 first/second bullet 55.4 44 48.2 31/27 31/27 - 47 Round length, mm 147 147 147 147 147 112 147 First/second bullet muzzle velocity, m/s 818 818 818 735/680 730/700 Accuracy of fire at 300 m (R50), cm max 19 max 19 max 20 max 50 max 50 Penetration, m: 15mm armour up to 100 20mm armour set at 20° up to 750 up to 100 Tracing time, sec - min 3 - min 2.9 Tracing range, m - - 1,000 Trace deviation from barrel end, m - 50-120* Case material brass