Cheytac

The CheyTac Intervention is an American bolt-action sniper rifle manufactured by CheyTac LLC. It is fed by a 7-round detachable single-stack magazine. It's specifically chambered for .408 Chey Tac or .375 Chey Tac ammunition. CheyTac LLC states that the system is capable of delivering sub-MOA accuracy at ranges of up to 2,500 yards (2,300 m), one of the longest ranges of all modern-day sniper rifles. It is based on the EDM Arms Windrunner.

Cartridge, bullets and barrels[edit]

CheyTac specially developed the .408 CheyTac/.375 CheyTac cartridge for long-range use. The cartridge is optimized for accuracy by a balance of the rotational and linear drag, which reduces yaw and precession, and keeps the tip of the projectile pointed along the trajectory.

To achieve balanced flight the rifling twist rate for the .408 CheyTac chambering was chosen at 330.2 mm (1:13 in), with eight 0.4080 in diameter grooves, 0.4010 in diameter bore and a 0.050" land width, square cut, with no taper. The later .375 CheyTac round, developed from the .408 CheyTac, uses a 292 mm (1:11.5 in) rifling twist rate.

Accessories[edit]

Muzzle brake[edit]

The McArthur PGRS-1 muzzle brake can be used to reduce recoil. It was designed by gunsmith and firearm inventor, Bruce McArthur, owner of The Flint & Frizzen Gun Shop in Clarkston, Michigan.^{[citation needed]}

Day and night optical sight systems[edit]

There are two different day optical sights available. The primary sight is the Nightforce NXS 5.5-22x56 variable magnification telescopic sight with a 56 mm objective. The alternate sight is the US Optics SN-9. The night vision system is the AN/PVS-14 GEN III Pinnacle monocular, which attaches to the day optic using the Monoloc device. An AN/PEQ-2 infrared laser provides additional lighting in low-light conditions. The device is attached to a titanium strut.^[1]

Meteorological and environmental sensor package[edit]

The KESTREL 4000 (or, 4500 NV) meteorological and environmental sensor package measures the wind speed, air temperature, air pressure, relative humidity, wind chill, and dew point. The KESTREL 4500 NV model is compatible with night vision devices.^[1][2]

Laser rangefinder[edit]

Vector laser range finder binoculars.

A Vector IV mil spec laser rangefinder measures distances up to 6 km (3.7 mi), and houses a digital compass and class 1 eye safe filters.^[1]

Advanced Ballistic Computer[edit]

The CheyTac Advanced Ballistic Computer (ABC) System software package uses tabulated bullet flight data derived from high speed Doppler radar test sessions, and mathematical models to predict ballistic trajectory. It runs on Windows Mobile 2003 and receives input from the Kestrel handheld weather station and Vector IV laser rangefinder binoculars.^[1] However, much like other ballistic prediction software, when rounds are used for which no Doppler Radar-established bullet flight data is known, the ABC System relies solely on mathematical ballistic models like all other ballistic prediction computer programs. Printed data tables are available for manual use.^[1]Without computer support the effectiveness of some long-range shooters could be severely reduced, since they may rely heavily on computer support to obtain correct ballistic solutions.