While this pressure wave is created at any speed, it becomes noticeable as a 'crack' once the bullet surpasses the speed of sound (which is approximately 1125 feet per second). At that speed, the pressure waves can't get out of the way fast enough - and they merge together as a 'crack' that travels away from the bullet at the speed of sound.
#Subsonic 223 decibels crack
Unlike the report of the firearm, which has a very specific origination point, the supersonic crack actually originates along the entire path of the bullet - as long as it's traveling faster than the speed of sound.īecause the supersonic crack is traveling with the bullet, it can't be localized the same way a typical gun shot can. Many hog hunters will point out that although the hogs can definitely hear the crack, they don't know where to run when using a suppressor. There are lots of factors that impact how loud the supersonic crack is but, in most of our testing we've found it isn't very loud compared to the report of the firearm. 22, for example, the difference between subsonic and supersonic ammunition is typically only a couple of decibels. Having said that, the decibel level doesn't tell the whole story for a couple of reasons: 22 because it's easy to get ammo that runs just under or over the speed of sound - so we could eliminate other variables.) There's actually a bigger difference when going from a low-end to a high-end model. The supersonic crack is a sharp sound that's typically less comfortable than the 'thud' of a suppressed round.Every shooter has a different comfort level when it comes to sound and, if you're already close to you maximum level the supersonic crack will probably push you over it.Īs a result, it often sounds like it's louder than it really is - which has a real impact on whether the shooter feels like they need additional hearing protection.In other words, even though it isn't that loud in the grand scheme of things, the supersonic crack can make a real difference to how much you enjoy shooting. Why is it a Bad Idea to Always Shoot Subsonic Ammo? #SUBSONIC 223 MM AMMO CRACK# With semi-automatic rifles, such as the AR-15, they typically won't operate correctly unless they have enough blowback.While it's true that shooting subsonic ammunition is going to be quieter, it isn't always a good idea for a variety of reasons: Most barrels are designed with twist rates that are optimized for a specific caliber of bullet travelling at a standard velocity for that caliber.Subsonic ammunition just doesn't have enough pressure to make the rifle run correctly.
When using subsonic ammunition, the bullet is going far slower - and often won't be stabilized correctly.
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