Once the bullet leaves the suppressor and enters the air, the suppressor’s job is done. A suppressor can only moderate the sound of the gunshot at the muzzle by slowing and cooling the powder gases. If you own or are interested in owning a sound suppressor, the question “What’s subsonic ammo?” is an important one to answer. Many shooters use sound suppressors, also known as silencers, to reduce the risk to the shooter and bystanders. The sound of a gunshot can cause permanent hearing loss, even with infrequent exposure, and comprises several variables. When your priority is reducing the report of your firearm to a minimum, this requires the use of subsonic ammunition. The sonic boom produced by a bullet can’t cause the same level of disruption and is more akin to the crack of a bullwhip - which also creates a sonic boom. You may be familiar with this phenomenon if you’ve ever witnessed a supersonic jet fly overhead and cause a sound similar to a thunderclap. Whether your ammunition is subsonic or supersonic is important because when a bullet breaks the sound barrier, it creates a miniature sonic boom. If, however, the bullet leaves the muzzle at a speed slower than the speed of sound, it’s subsonic. If the bullet exceeds the speed of sound, thereby breaking the sound barrier, it’s supersonic. When you ask, “What is subsonic ammo?” the answer is simple. These powder gases are the primary source of a firearm’s report (the sound of the gunshot.) When you fire a cartridge, the propellant charge burns, generating high-pressure expanding gases that drive the bullet through the barrel.
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