In the case where you’re reducing the powder load to artificially slow the projectile down (subsonic. What you’ll see in ballistic gel is that heavier bullets tend to penetrate more deeply, deviate off course less, and many hollow points will actually expand to a larger diameter because there’s physically more bullet to do so (heavy bullets being larger - longer - than lighter bullets in a given caliber). Supersonic/subsonic simply has no relevance to bullet performance in these sorts of cases where it’s basically the same amount of powder energy either way and you’re just changing the bullet weight. I’ve been carrying 147 HST for many years and my carry guns aren’t suppressed.
147 grain loads have become the norm for self-defense 9mm and it’s effectively all subsonic. In fact, most LE and self-defense loads have gone to heavy-for-caliber bullets for the most reliable penetration and barrier penetration performance. In 9mm, for example, where bullet weight determines supersonic or subsonic, there’s really no performance difference due to that velocity change. 22 LR loads) it’s faster than the speed of sound at 32 degrees air temp but slower than the speed of sound at 72 degrees air temp. Example: if the bullet travels at 1,110 FPS (which is typical of many 9mm and. 22 LR loads, the speed of sound straddles the bullet’s velocity such that I’ve been out on the range shooting suppressed where every shot was supersonic in the morning in 30- to 40-degree temperatures (the speed of sound is ~1,090 FPS at 35 degrees) and every shot was subsonic in the afternoon in 60- to 70-ish-degree temperatures (the speed of sound is ~1,128 FPS at 70 degrees). Use THIS CALCULATOR to figure out the speed of sound where you are based on the temperature outside. Nerd note: air temperature is by far the biggest independent driving factor in your local speed of sound. In many cases the subsonic shot is, too, but either way what this means is that the difference between the two is being compressed. In part because the supersonic gunshot is louder than your speakers and, in all likelihood, louder than the microphone or camera will allow. While the video provides an idea of what it sounds like, the microphone and the camera and your speakers or headphones simply cannot reproduce it realistically. Note: it is significantly more pronounced in real life.
SUBSONIC FPS CRACK
And that supersonic crack or lack of it, my friends, is the sound difference you hear in the video. With a lightweight 115 grain bullet, it is enough “oomph” to fire the bullet at supersonic speeds. With a heavy, 147 grain bullet the “oomph” contained in the gunpowder isn’t sufficient to fire the bullet fast enough to exceed the speed of sound. There’s no difference in the actual noise of the gunshot, since it’s the same amount of gunpowder and same amount of pressure, etc., behind the bullet. In the video embedded above (or click HERE to view it directly on Rumble), we chose one of those cartridges - your standard 9mm pistol cartridge - to demonstrate the sound difference between subsonic and supersonic ammunition, because bullet weight is the only variable that’s changing. However, the velocity of some cartridges is so close to the speed of sound already that simply moving up or down in bullet weight is all that’s necessary to switch from supersonic to subsonic, or vice versa, without any change in the powder charge. 223 Remington to use effectively the same powder charge but cut the velocity by so much that the projectile is subsonic. For example, one cannot load a heavy enough projectile into a. Now, with many cartridges there’s also a difference in how much gunpowder is used. Much larger than most of us would suspect. Throw a silencer on, however, and now the gunshot sound is suppressed so heavily that the difference between subsonic and supersonic ammo is drastic. Subsonic or supersonic, the gunshot sound itself is so darn loud that it drowns out any sonic boom made by the bullet exceeding the local speed of sound. When shooting unsuppressed, the difference in nearly all cases is difficult or impossible to hear.
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