12.7×55mm
TypeRifle
Place of originRussian Federation
Production history
Designed2002
Specifications
Parent case.338 Lapua Magnum
Bullet diameter12.7 mm (0.50 in)
Case length54 mm (2.1 in)
Overall length94 mm (3.7 in)
Ballistic performance
Bullet mass/type Velocity Energy
59 g (911 gr) STs130PT 295 m/s (970 ft/s) 2,567 J (1,893 ft⋅lbf)
48.2 g (744 gr) STs130PT2 295 m/s (970 ft/s) 2,097 J (1,547 ft⋅lbf)
76 g (1,173 gr) STs130VPS 295 m/s (970 ft/s) 3,307 J (2,439 ft⋅lbf)

The 12.7×55mm Subsonic cartridge is used in some Russian firearms such as VKS bullpup sniper rifle and ASh-12.7 bullpup battle rifle and RSh-12 revolver. The cartridge can carry a projectile weighing between from 108 grains and 1173 grains yielding massive amounts of kinetic energy. The round can penetrate up to 16 mm (0.63 in) of steel at 200 meters or heavy body armor at 100 meters. The accuracy of this cartridge is claimed as to be 1 MOA at 100 meters range. Despite having the same designation, it appears that the ASh would not be able to feed or chamber rounds designed for the VKS due to significant length differences in the bullet component of the cartridge.

Cartridge variants for use in the VKS

Cartridge variants for use in the ASh-12.7


This article uses material from the Wikipedia article 12.7×55mm STs-130, which is released under the Creative Commons Attribution-Share-Alike License 3.0.