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On 14 July 2017, the UK Ministry of Defence issued a tender for a five year (plus five years optional) contract to supply .300 Blackout supersonic and subsonic small arms ammunition. Also noted was the fact that the ammunition type had already been in use.
Alternatively, specialized firearms and ammunition may be used to optimize total subsonic ammunition effectiveness. These are designed from the start as dedicated subsonic projectile systems. Some examples include .300 Whisper, 300 AAC Blackout, .338 Whisper, 8.6mm Blackout, 9×39mm, 12.7×55mm STs-130, .500 Whisper, and .510 Whisper.
The .300 Whisper (7.82×34mm) is a CIP standard [1] cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries.It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities.
A subsonic cartridge is designed to fire its bullets at velocities slower than the speed of sound (1128 ft/s at 70 °F) to avoid the sonic crack caused by the bullet breaking the sound barrier. This allows the cartridge to be sound suppressed relatively easily.
The subsonic round is originally designed to have an optimistic effective lethal range of 400 to 530 meters and a maximum penetration of up to 10 mm of steel. Like the 5.45×39mm cartridge, the 9×39mm SP-5 features an air pocket in the tip, which increases its tendency to yaw or "keyhole" upon impact, thus increasing soft tissue damage in ...
For projectiles in unpowered flight, its velocity is highest at leaving the muzzle and drops off steadily because of air resistance.Projectiles traveling less than the speed of sound (about 340 m/s (1,100 ft/s) in dry air at sea level) are subsonic, while those traveling faster are supersonic and thus can travel a substantial distance and even hit a target before a nearby observer hears the ...
The cartridge can be loaded for either subsonic or supersonic muzzle velocities. [ 2 ] Much like the 300 AAC Blackout , the Musang cartridge can be loaded into STANAG magazines (with 25 rounds able to fit into a standard 30-round M16 magazine) and requires only a barrel change to be used on an AR-15.
The propellant charge of subsonic ammunition is reduced to keep the bullet velocity (300–320 m/s (980–1,050 ft/s) below the speed of sound (~ 340 m/s (1,100 ft/s)). At this subsonic speed the supersonic crack that arises when standard ammunition is fired is avoided. The manufacturer recommends exclusive use of subsonic ammunition for the ...