jheitertusa
New member
.Its around 800 FPS .The .45 ACP is the only factory ammo. that qualifies
As RAnb mentioned earlier, the speed of sound is the rate of travel of a sound wave through an elastic medium. In dry air at 20 °C (68 °F), the speed of sound is 1125 ft/s. Or about 768mph.
There are quite a few factory cartridges that qualify as "subsonic."