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Subsonic ammunitions are ammunitions designed to operate at velocities below the speed of sound (Mach 1), which at standard conditions is 340.29 m/s (1,116.4 ft/s). This avoids the supersonic shockwave or "crack" of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot.
The Whisper family was developed as a line of accurate, multi-purpose cartridges using relatively heavy rifle bullets for a given caliber in subsonic loads. [ 1 ] [ 2 ] [ 3 ] The intention was to create an extremely accurate cartridge family for military, police, competition and specialized hunting markets that could also be easily sound ...
The .308 Winchester has a 3.64 mL (56 gr H 2 O) cartridge case capacity. [9] The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions. .308 Winchester maximum C.I.P. cartridge dimensions. All dimensions in millimeters (mm) and inches.
For example, if the muzzle velocity is reduced from 2,700 ft/s (820 m/s) (common for the .308 Winchester, for example) to a subsonic 950 ft/s (290 m/s), the muzzle energy is reduced by a factor of 8. Military marksmen and police units may use subsonic ammunition in suppressed rifles when minimal noise is more important than range and energy. [58]
Brittle failure may occur at subsonic velocity. Attempting to crimp a brittle frangible bullet into the cartridge case may break the bullet. [ 1 ] Brittle frangible bullets may break during the self-loading cycle of semi-automatic firearms ; [ 2 ] and those fired from revolvers often break as the bullet encounters the barrel forcing cone after ...
Caliber/calibre: In small arms, the internal diameter of a firearm's barrel or a cartridge's bullet, usually expressed in millimeters or hundredths of an inch; in measuring rifled barrels this may be measured across the lands (.303 British) or grooves (.308 Winchester) or; a specific cartridge for which a firearm is chambered, such as .45 ACP or .357 Magnum.
.338 Federal (.308 Winchester).408 Cheyenne Tactical.300 Winchester Magnum.338 Lapua Magnum 6.5×47mm Lapua 6.5-284 Norma.40 Lobaev Whisper.375 Cheyenne Tactical 2010–present SVL variant chambered for .408 Cheyenne Tactical is used by the Federal Protective Service of Russia. [7] Other variants include OVL, SVLK-14S, SVLK-14M, DXL, TSVL and DVL.
A headstamp is the marking on the bottom of a cartridge case designed for a firearm.It usually tells who manufactured the case. Military headstamps usually have only the year of manufacture .