![]() ![]() ![]() 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. 300 Whisper / 300 AAC Blackout (7.62×35mm). To put things in perspective, a suppressed rifle firing subsonic 22 LR ammo will still issue a report of approximately 120 decibels. 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. INTRODUCTION For high - bypass - ratio fan engines operating at subsonic fan. Answer (1 of 4): As others have noted, CCI Quiet is rated at 68 decibels at the shooters ear. That’s an average reduction of 36dB between the unsuppressed and suppressed shots. When shooting with a silencer, the levels come in at an average of 135-145dB. For example, the traditional American military standard. The data are also about 6 decibels less than predicted by extrapolation of. Atomic Ammunitions 223 Remington Subsonic is unlike any. Unsuppressed, we recorded an average of 166-171 dB for the 16 and 20 AR15 rifles. 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 1.1 Subsonic versions of standard rounds. ![]()
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