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Compared to the high-velocity (supersonic) unsuppressed condition, the combination of subsonic low-velocity ammunition and a firearm suppressor provided reductions of 45, 38, 40, and 48 dB, peak sound pressure level at the muzzle, left, right ears and behind the shooter, respectively.
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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.
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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).
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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.
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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
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Combined with firearm sound suppressors, subsonic ammunition may significantly reduce sound levels compared to normal ammunition. Specific reductions depend on the ammunition and suppressor.
383:
Murphy, William J.; Flamme, Gregory A.; Campbell, Adam R.; Zechmann, Edward L.; Tasko, Stephen M.; Lankford, James E.; Meinke, Deanna K.; Finan, Donald S.; Stewart, Michael (2018-01-26).
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Shooting Range
Industries. Shooting Terms; What Is Bullet Drag, Bow Shockwave, Mach Speed Number, Boat Tail & More - Shooting Range Industries. Available at: <
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Some ammunition types were inherently designed with heavier, slower standard bullet weights and velocities. For example, the traditional
American military standard
149:
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.
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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.
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In this instance, heavier bullets are loaded in standard ammunition, which reduces muzzle velocity below the speed of sound.
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http://www.shootingrangeindustries.com/shooting-terms-what-is-bullet-drag-bow-shockwave-mach-speed-number-boat-tail-more/
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385:"The reduction of gunshot noise and auditory risk through the use of firearm suppressors and low-velocity ammunition"
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1), which at standard conditions is 340.29 m/s (1,116.4 ft/s). This avoids the
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Silencer
History and Performance, Vol 2: CQB, Assault Rifle, and Sniper Technology
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History and Performance, Vol 1: Sporting And Tactical Silencers
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Ammunition designed to operate at velocities below the speed of sound
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Suppressor § Subsonic ammunition and reduced sonic signature
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or "crack" of a supersonic bullet, which, particularly for
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Paulson, Alan C; Kokalis, Peter G.; Parker, N.R. (2002).
23:.22 Long Rifle Remington Subsonic hollowpoint ammunition
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50:firearms, influences the loudness of the shot.
34:designed to operate at velocities below the
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63:Subsonic versions of standard rounds
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389:International Journal of Audiology
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70:As an example, the very common
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401:10.1080/14992027.2017.1407459
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103:Specialized subsonic calibers
114:300 AAC Blackout (7.62×35mm)
83:Inherently subsonic calibers
7:
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91:ammunition load, of a 230
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317:Paulson, Alan C (1996).
242:Behind Shooter (dB SPL)
167:Behind Shooter (dB SPL)
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230:Suppressor Condition
155:Suppressor Condition
136:Use with suppressors
44:supersonic shockwave
28:Subsonic ammunitions
239:Right Ear (dB SPL)
164:Right Ear (dB SPL)
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395:(sup1): S28–S41.
346:. Paladin Press.
321:. Paladin Press.
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236:Left Ear (dB SPL)
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161:Left Ear (dB SPL)
126:12.7×55mm STs-130
72:9×19mm Parabellum
58:Standard calibers
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247:Unsuppressed
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172:Unsuppressed
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130:.510 Whisper
118:.338 Whisper
110:.300 Whisper
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32:ammunitions
447:Ammunition
304:References
264:Suppressed
189:Suppressed
48:suppressed
409:1499-2027
281:Reduction
206:Reduction
441:Category
427:29299940
418:8588962
89:.45 ACP
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122:9×39mm
93:grain
423:PMID
405:ISSN
370:>
348:ISBN
323:ISBN
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40:Mach
30:are
413:PMC
397:doi
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
