9x39 BP 7N12 (Blacktip)
In 2002, KBAL specialists jointly with the Tula Cartridge Plant Design Bureau under the state order began the development of new, modernized 9.0 mm caliber cartridges. To replace the cartridge SP-6 was developed a cartridge with an armor-piercing bullet BP. The cartridge is intended for the destruction of manpower, protected by means of individual protection at ranges up to 400 meters. The BP bullet consists of a bimetallic shell with a truncated apex, a steel core and a lead shirt. Bullet BP provides penetration of a steel sheet 7 mm thick from steel grade St.3 at a range of 100 m.
In 2004, at the plant No. 539 (Tula Cartridge Plant) serial production of a cartridge, adopted for service under the GRAU 7N12 index, was deployed. Until 2009, cartridges were produced with steel sleeves with phosphate-lacquer coating, and in 2010, the production of cartridges with steel sleeves with a phosphate-polymer coating was mastered. Serial cartridges have a distinctive marking in the form of a black top of a bullet and a black strip on the package. The cartridges have a symbol on the package 9x39 BP gs and.
Characteristics of the cartridge
Caliber - 9x39; BP
Length of the cartridge, mm - 55,6-56,2;
Mass of the cartridge, g - 22,4-22,6.﻿
Powder Charge Characterization
Type of gunpowder - smokeless, pyroxylin;
The brand of gunpowder is P-45;
Mass of powder charge, g - 0,5-0,6;
Loading density, g / cm3 - 0.56;
Maximum pressure of powder gases, kg / cm2 - 2800;
Form and size of the powder grains - cylinder with a channel:
- outer diameter, mm - 0,64-0,94,
- internal diameter, mm - 0,1-0,2,
- length, mm - 0,9-1,3.﻿
Characteristics of the bullet
Bullet type - semi-shell;
Bullet weight, g - 15,4-15,6;
The length of the bullet, mm - 40,0-41,0;
Diameter of the leading part of the bullet, mm - 9,22-9,27;
The transverse load of the bullet, g / cm2 - 24,0;
Ballistic coefficient of the bullet, m2 / kg - 2,1;
The material of the sheath of the Puni is steel, clad with a tompak;
Bullet shell weight, g - 3.9-4.3;
Material of the core of the bullet - tool steel U12A;
Mass of the bullet core, g - 9.2-9.5.
Characteristics of the cartridge case
The shape and type of the sleeve - bottle, wafer;
The weight of the shell with the capsule, g - 6,7-7,0;
The length of the sleeve, mm - 38,4-38,7;
Free volume of the sleeve, cm3 - 2.53;
The volume of the cartridge case with a planted bullet, cm3 - 1.0;
The liner material - steel, varnished;
The method of fastening the bullet is a tight fit and crimping of the edge of the collar of the cartridge case.
The cross-sectional area of the bore of the barrel rifle VSS, AS VAL, cm2 - 0.65;
The initial speed of the bullet rifle VSS, AS VAL, m / s - 285-295;
The muzzle energy of the bullet rifle VSS, AS VAL, J - 649.8-704.9;
Penetration: 90% steel sheet 7 mm of steel grade St.3 per 100 m;
Marking: the top of the bullet is black.