7.62 x 39 mm

The 7.62x39mm bullet is of soviet origin and was designed during World war 2 and used in RPD machine guns. 
    Due to its world wide usage of SKS and AK-47, this bullet is used by both militaries and civilians alike.

This bullet is tested in extreme conditions and can be used from -50 to 50 degree C. It is tested in both extreme temperature of the polar to the burning hot deserts. 

It is influenced my many foreign modifications including German, and US used in M1 carbine.

  Shortly after World War 2 this bullet was used in worlds most popular military Patten rifle, The AK-47 its still used in AK series rifles all around the world, it remained soviet standard for a long time but now the modern AK-47 uses 5.45x39mm cartridge ammo.

The Russian commercial ammo can also be found in Soft point (SP) rounds, and Hollow point (HP), the soft point and hollow points provide improved accuracy. 

Ammo specifications for 57-N-231
Cartridge weight: 16.3 Grams
Bullet weight: 7.9 Grams
Muzzle velocity: 718 m/s
Muzzle energy: 2036j
Accuracy at 300m: 75mm

Ammo specifications for 57-N-231p (tracer round)
Cartridge weight: 16.1 Grams
Bullet weight: 7.57 Grams
Muzzle velocity: 718 m/s
Muzzle energy: 1951j
Accuracy at 300m: 140mm

Ammo specifications for 57-T-231PM1 (tracer round)
Cartridge weight: 16.05 Grams
Bullet weight: 7.55 Grams
Muzzle velocity: 718 m/s
Muzzle energy: 1946J
Accuracy at 300m: 140mm