Shooting Terms What Is Bullet Drag, Bow Shockwave, Mach Speed Number, Boat Tail & More - Shooting Range Industries. 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. Please call our shop for more information on +64 3 379-8888 in Christchurch, New Zealand.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. We have the largest range of guns, ammo & accessories available now, online in New Zealand. We have been selling, importing, exporting, manufacturing, customising, and repairing firearms & accessories since 1978. Gun City is NZ's largest firearms dealer. The form can be found from the link below. Purchase of this item requires a firearms licence, you will need to complete a Police Order Form and take it into your local police station to have it signed off. Reusable plastic box with dispenser lid.Clean-burning propellants keep actions cleaner.Quieter than high-speed 22 LR hollow point loads.Large HP cavity for reliable expansion at sub-sonic velocity.Trajectory matches most target loads to 50 yards.Special 40 grain lead hollow point nose at 1050 ft/sec.Sub-Sonic HP is loaded with consistent CCI primers and brass. Clocking in at sub-sonic velocites, this load creates less noise, yet its bullet expands reliably for quick kills on a variety of small game.
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