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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.
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. [1] [2] [3]
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.
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 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 ...
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.
Specifically designed and optimized for 300-1000m competition. [19] 6.5 Grendel: ... .300 AAC Blackout: 2011 US 2 [7] [13] R [13] 7.62×35mm ... subsonic applications ...
300 AAC Blackout : Uses military 5.56x45 (also .223). The shoulder is reformed, length is trimmed, neck is sized to .308. This caliber is very popular, and examples are available in a wide variety of styles. Bullet weights can currently be found between 100gr to 220gr 7.62x40 Wilson Tactical (300 HAM'R) : Uses 5.56 NATO cases (also .223 ...