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VSSK Vykhlop

VSSK and the additional name Vykhlop (or, incorrectly, Vychlop) is a Russian bullpup, straight-pull bolt-action, magazine-fed sniper rifle chambered for the 12.7 x 55 mm subsonic round. It was developed in around 2002 for the special force units of FSB.12.7mm Vychlop (Exhaust) silenced sniper rifle is developed for special operations that require silent firing and penetration much superior to that provided by 9mm VSS silenced sniper rifle. Typical targets for VKS / VSSK Vychlop rifle are cars, terrorists in heavy body armor or behind covers like car bodies or other thick covers. The core of the VKS / VSSK system is specially developed 12.7mm (.50 caliber) reduced power ammunition that launches bullets at subsonic muzzle velocities of about 290 meters per second (~950 fps). Case lenght of the STs-130 family is 54mm, overall length of the new 12.7mm round designated STs-130PT is given as 97mm, significantly less that of standard Russian 12.7x108 HMG round (145mm overall length). Standard loading for this round is precision machined solid bronze projectile with pointed nose, weighting around 59 gram (910 grains) or 76 gram (1170 grains) high penetration AP bullet. Accuracy is claimed as 1 MOA at 100 meters range with precision bullets, and maximum effective range is given at 600 meters. High penetration bullet can defeat Russian Class 5 (US NIJ Type III / High-Powered Rifle) body armor at 100 meters or 16mm steel plate at 200 meters. The STs-130 cases are based on the .338 Lapua Magnum cases with straight (no neck), slightly tapered body.