Silencer History and Performance, Vol 2: CQB, Assault Rifle, and Sniper Technology. Silencer History and Performance, Vol 1: Sporting And Tactical Silencers. 223 caliber bolt-action rifle firing low-velocity (subsonic) ammunition using a GEMTECH G5-5.56 suppressor.Ĭompared 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. 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. Specific reductions depend on the ammunition and suppressor. Main article: Suppressor § Subsonic ammunition and reduced sonic signatureĬombined with firearm sound suppressors, subsonic ammunition may significantly reduce sound levels compared to normal ammunition. These are designed from the start as dedicated subsonic projectile systems. 45 ACP ammunition load, of a 230 grain bullet at 850 feet per second, is naturally subsonic.Īlternatively, specialized firearms and ammunition may be used to optimize total subsonic ammunition effectiveness. For example, the traditional American military standard. ![]() Some ammunition types were inherently designed with heavier, slower standard bullet weights and velocities. Subsonic ammunition with normal bullet weights often fails to properly function in such firearms. Subsonic loads for 9mm commonly use 9.5 grams (147 gr) bullets at velocities of 300 metres per second (980 ft/s).įor these ammunition loads, balancing bullet weight and velocity are required to ensure that the ammunition will still reliably cycle semi-automatic firearms. ![]() In this instance, heavier bullets are loaded in standard ammunition, which reduces muzzle velocity below the speed of sound.Īs 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). Standard calibers Subsonic versions of standard rounds Some subsonic ammunition is used in non-suppressed firearms to gain the advantages of heavier bullet weights. Subsonic ammunition usually uses heavier bullets to retain as much energy as possible at the lower velocities. This avoids the supersonic shockwave or "crack" of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot. This round is recommended for use in barrels 9-inches or longer.Subsonic ammunitions are ammunitions designed to operate at velocities below the speed of sound, which at standard conditions is 340.29 m/s (1,116.4 ft/s) or Mach 1. Muzzle velocity is 1000 fps and muzzle energy is 455 ft-lbs from a 16-inch barrel. ![]() This was achieved by SIG SAUER engineers after extensive research and development resulting in a stepped-down bullet design with a shouldered ogive that keeps the bullet from hitting the ridges of the magazine which would cause the rounds to shift and eventually fail to feed. This load is ideal for use with a suppressor, which greatly reduces sound signature and muzzle flash, making it a favorite among hunters. Optimized for the AR-15 platform, the new subsonic 300BLK Tipped Hunting ammunition is engineered to allow hunters to load 30 rounds in a 30-round magazine and have the cartridges feed properly. Sig Sauer E300H2-20 300Blk 205 Grain Subsonic Tipped Hunting Ammo
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