For this reason people shooting with a silencer prefer subsonic loads, even when shooting a rifle. The standard weight for a 9mm bullet is 115 grains, but subsonic 9mm bullets can range in weight from 147 to 158 grains. That threshold is somewhere around 1,126 feet per second, so most modern rounds. However, the specific velocity can vary depending on the manufacturer and the load. Its designed to travel at speeds below that of sound, hence the name subsonic. With heavier grain weights, subsonic 9mm ammo retains impact power despite the lower velocity, translating into a highly effective round for hunting or self defense. The typical subsonic 9mm ammunition velocity is around 900 feet per second or less. This design results in mild felt recoil and ultra-quiet performance when run through a suppressor. As a side note, if a silencer is attached to the gun it will only suppress the muzzle-blast noise. Subsonic 9mm ammunition is engineered to have a velocity below the speed of sound. ![]() When you're shooting a PCC, Seismic Ammo even makes 185gr rounds with a 950fps muzzle velocity made for suppression on longer barrels and an increased payload on hits. Subsonic loads do not have this second component of noise. The American Eagle 124gr Suppressor 9mm cartridge is excellent for practicing and has a muzzle velocity of 1030 fps. But if you reduce the velocity to a subsonic 1100 fps, it produces only 150. The noise that shooting makes has two components, the noise of the hot gases escaping the muzzle and sometimes flashing as they hit the atmosphere (muzzle blast), and in the case of supersonic loads the crack of the sonic boom as the bullet breaks the sound barrier. At 3250 fps, it produces 1,280 foot-pounds of energy at the muzzle. Most rifle loadings are all supersonic, so subsonic loads are specially down-loaded to stay below the speed of sound. In 9mm, most loading data are supersonic. All data in this caliber is subsonic but is not normally tagged with the name subsonic. Subsonic 9mm loads from Bullets 1st use 147-grain projectiles traveling at 1,020 feet per second. Not all "subsonic" loads are noted as such in the data, because the cartridge is not capable of producing supersonic velocity. Subsonic loads refer to those whose velocity is less than the speed of sound.
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