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ⓘ Subsonic ammunition is ammunition designed to operate at speeds below the speed of sound, which at standard conditions is 343.2 ms. This avoids the supersonic s ..




                                     

ⓘ Subsonic ammunition

Subsonic ammunition is ammunition designed to operate at speeds below the speed of sound, which at standard conditions is 343.2 m/s. This avoids the supersonic shockwave or "crack" of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot.

Subsonic ammunition usually uses heavier bullets to retain as much energy as possible at the lower velocities. Some subsonic ammunition is used in non-suppressed firearms to gain the advantages of heavier bullet weights.

                                     

1. Standard calibers

Subsonic versions of standard rounds

In this instance, heavier bullets are loaded in standard ammunition, which reduces muzzle velocity below the speed of sound.

As an example, the very common 9×19mm Parabellum standard military round is a 7.5 grams 116 gr bullet at velocities typically around 360 metres per second 1.200 ft/s. Subsonic loads for 9mm commonly use 9.5 grams 147 gr bullets at velocities of 300 metres per second 980 ft/s.

For these ammunition loads, balancing bullet weight and velocity are required to ensure that the ammunition will still reliably cycle semi-automatic firearms. Subsonic ammunition with normal bullet weights often fails to properly function in such firearms.

Inherently subsonic calibers

Some ammunition types were inherently designed with heavier, slower standard bullet weights and velocities. For example, the traditional military standard.45 ACP ammunition load, of a 230 grain bullet, is subsonic.

                                     

2. Specialized subsonic calibers

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 7.62×35mm.338 Whisper, 9×39mm, 12.7×55mm STs-130.510 Whisper.

                                     

3. Use with suppressors

Combined with firearm sound suppressors, subsonic ammunition may significantly reduce sound levels compared to normal ammunition. Specific reductions depend on the ammunition and suppressor.

The peak sound pressure levels of a Remington 700.223 caliber bolt action rifle firing high-velocity supersonic ammunition using a GEMTECH G5-5.56 suppressor.

The peak sound pressure levels of a Remington 700.223 caliber bolt action rifle firing low-velocity subsonic ammunition using a GEMTECH G5-5.56 suppressor.

Compared to the high-velocity supersonic unsuppressed condition, the combination of subsonic low-velocity ammunition and a firearm suppressor provided a reductions of 45, 38, 40, and 48 dB, peak sound pressure level at the muzzle, left, right ears and behind the shooter, respectively.

                                     
  • AKS - 74U but in a bullpup configuration and chambered for 9x39 SP - 6 subsonic ammunition The trigger - pistol grip unit could be removed and replaced with
  • barrel with a 1: 250 mm 1: 10 inches twist designed to handle heavy subsonic ammunition in conjunction with a suppressor. The bolt action uses rear - locking
  • forearm. The VSK - 94 is equipped with a 4x PSO - 1 optical sight adapted for subsonic rounds shooting and standard flip iron sights from the 9A - 91. The threaded
  • and a rubber wipe. It was designed for use in conjunction with subsonic rifle ammunition The PBS - 1 has been extensively tested by the United States Army
  • cartridges using relatively heavy rifle bullets for a given caliber in subsonic loads. The intention was to create an extremely accurate cartridge family
  • several product lines of ammunition Original JHP DPX Performance Match Urban Response Hunting Lines Multi - Purpose Rifle Subsonic Ammo Glaser Safety Slug
  • full - auto fire. Osprey, which can be used with 300 Blackout subsonic rifle ammunition and is available in 9mm, 40, and 45 caliber bores. Octane, a
  • special 7.62 25mm Type 64 ammunition with heavy, subsonic bullets, but can also fire standard 7.62mm Type 51 7.62 25mm TT ammunition with increased loudness
  • interchanged with those of the K1 and vice versa. As the K7 uses subsonic ammunition 9 19mm there is little need for the weapon to use the direct gas
  • especially effective with the 9 39mm subsonic cartridge. The magazine is made of black polymer, holds 20 rounds of ammunition and appears to be of proprietary
  • 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
  • A cartridge or a round is a type of pre - assembled firearm ammunition packaging a projectile bullet, shot, or slug a propellant substance usually either

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