Subsonic is anything traveling slower than the speed of sound, which is generally accepted to be 1,100 feet per second. at sea level (depending on conditions), the two pressure waves combine into a single shock wave that produces a booming sound when the bullet passes by. When the bullet reaches the speed of sound which is around 1125 fps. Īt what FPS does a bullet become supersonic? CCI’s Subsonic HP, for example, reduces velocity to 1050 fps and therefore lowers the decibel level to around 68, almost half the normal high-velocity. Is 1050 fps subsonic?Īll the major ammunition manufacturers offer subsonic. At such low speeds, propellers provide a very fuel efficient propulsion system. Typical speeds for subsonic aircraft are less than 250 mph, and the Mach number M is much less than one, M << 1. Anything faster is supersonic, anything at or around that speed is transonic, and anything below that velocity is subsonic.įor aircraft speeds which are very much less than the speed of sound, the aircraft is said to be subsonic. Technically, any ammunition that achieves less than supersonic velocity is in and of itself subsonic, which is 1,126 ft per second.
What was harder to believe was the results. I haven’t lubricated this pistol in years- and it functioned 100% during during this testing! Hard to believe. For the testing conducted in this article, I withdrew the Kel-Tec from my IWB holster, unloaded the magazine and chamber, blew away the pocket lint, and started shooting. It’s about 15 years old, and has literally shot just about every type of 9mm ammunition I could throw at it with near 100% reliability. My Kel-Tec PF9 is my everyday city carry gun (and ranch carry outside of bear season). **Note that two shots for the Canik TP9SFX data were not recorded due to a shot alignment issue (human error) Shocker: Kel-Tec PF9 Chronograph Data The Canik TP9SFX has proven to be an accurate pistol, and this load worked well with it for sure! The accuracy for the Canik TP9SFX and the Glock 17 (without suppressor) were very comparable.Ĭhronograph Data: Glock 17 and Canik TP9SFXĪccuracy for this 147 grain subsonic load was awesome, but it was the chronograph data where things were even more impressive, with a twist! Here’s a roll-up of the Glock 17 and Canik TP9SFX data: (click/tap to enlarge) The Glock 17 (with same Bear Creek Arsenal threaded barrel) shot *slightly* better without the suppressor, but not enough to make a difference for what I have planned. This setup (Glock 17 and Osprey 45 suppressor) is the result I cared about most for this load since it’s the setup I plan to use to shoot subsonic 9mm most frequently (at least, until I get a threaded barrel for the Canik TP9SFX!). The following is a summary of this testing. I shot 5-shot groups for each pistol (multiple sets) until things settled down and “round groups” were observed.
Subsonic fps full#
For the testing of this 147 grain 9mm load, I shot 5-shot groups through my Glock 17 (with and without Osprey 45 Suppressor), and my Canik TP9SFX (see this article for full review of that pistol). It literally takes the “human factor” out of the equation. The Ransom Rest is an invaluable tool for testing handgun accuracy.
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