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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 DSR-1 Subsonic is a variant optimized for 7.62×51mm NATO/.308 Winchester subsonic ammunition usage. The barrel length is reduced to 310 mm. The barrel length is reduced to 310 mm. The 8 inch twist rate of the barrel is especially adapted to stabilize the long heavy projectiles used in subsonic ammunition.
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]
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 ...
7.62mm Thumper is a barrel specification optimized to run larger bullets out of standard 7.62×39mm cases. [1] Barrels are cut to a standard 7.62×39mm "Russian" chamber but the bore ideally uses a faster 1:8" rifling twist rate in order to stabilize bullets heavier than 200gr at subsonic speeds. [2]
An integral suppressor is featured on the K7, which leaves users the option to use standard 9mm Parabellum ammo instead of using subsonic ammo. [9] The K7's upper receiver is based on that of the K2, albeit slightly modified. [4] The hammer/fire control unit and telescopic stock are also derived from those of the K1. [4] [10]
Typical .375 SOCOM loads will launch a 200 grain bullet 2400 feet per second from a 20" barrel. In a short barrel suppressed subsonic application, the .375 SOCOM can be made to easily cycle the AR-15 action, using fairly fast burning propellants such as IMR 700X, Trail Boss and VV N32C (Tin Star). This can be problematic with the .458 SOCOM ...
The information regarding unfavourable transonic/subsonic flight behavior for some of the tested projectiles is important. This is a limiting factor for extended range shooting use, because the effects of limit cycle yaw are not easily predictable and potentially catastrophic for the best ballistic prediction models and software.