![]() ![]() The powders that are used are often better than those of many OEM manufacturers, producing the best subsonic round available This ammunition intentionally does not cycle the action of rifles. 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. No surplus powders or primers are used to build our ammunition. 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. I bought 2 boxes of subsonic 7.62 x39 ammo to tinker with in my Yugo SKS with the gas valve shut off. Some ammunition types were inherently designed with heavier, slower standard bullet weights and velocities. I recall seeing it posted somewhere regarding suppressing an AK or something, but wanted to pass this along. Subsonic ammunition with normal bullet weights often fails to properly function in such firearms. Extreme spread at each charge weight was horrible, around 10-15. None of them cycled the action with the suppressor installed. Velocities averaged from approximately 650fps at 9gr to 850fps at 10gr. 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. 2gr increments, for a total of 18 rounds. 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 1.1 Subsonic versions of standard rounds.
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