Generally speaking, the speed of sound is 1, feet per second, so anything at that speed or above is considered to be supersonic.
Or, you can be like the rest of us and just use 1,fps as the general rule of thumb for the threshold between subsonic and supersonic. Subsonic is anything traveling slower than the speed of sound, which is generally accepted to be 1, feet per second.
So, anything traveling less than that is subsonic. Again, as we mentioned above, you can get very specific and scientific if you want, or you can use sub-1,fps as the threshold between the two.
Simply put, yes, a supersonic bullet is louder than a subsonic bullet. This is because the supersonic bullet is traveling faster than the speed of sound, which produces a cracking sound when it breaks the sound barrier. Since subsonic bullets travel slower than the speed of sound, they do not break the sound barrier and do not produce a supersonic crack. Yes, you can shoot subsonic ammo without a suppressor — but there are some things to be aware of, particularly when using it in conjunction with a semi-automatic firearm.
Since subsonic ammo has a lower velocity and slower speed than supersonic ammo, you might find that it cannot provide enough energy to properly cycle the semi-automatic action on your gun. One way to remedy this would be with the AR platform and the use of an adjustable gas block.
The more nuanced answer: there are fewer companies making subsonic ammo than there are supersonic ammo. Another factor is the cost of the manufacturing materials. Generally speaking, the specific materials needed to produce subsonic ammo cost more than those for supersonic ammo. If quiet shooting with subsonic ammo and a suppressor is something you want to check out, be sure to get in touch with us.
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Home Blog Ammunition Comparing Subsonic vs. Supersonic Ammunition Ammunition. April 7, By Brandon Maddox. Contrary to what the name might suggest, the sound barrier is not an actual wall or barrier. Rather, it is the hypothetical limit to the speed an object can travel before it exceeds the speed of sound.
Traveling at the speed of sound might sound like an abstract concept, but the key to breaking the sound barrier is found in the relationship between sound and speed. Sound is caused by vibrations that travel in the form of waves i. This works out to mph at sea level. Keep in mind that the speed of sound becomes slower at higher altitudes due to air molecules moving at a slower rate as temperatures lower.
Essentially, the speed of sound becomes faster the higher the temperature goes. Bullets have the ability to travel up to twice the speed of sound.
Their speed is influenced by multiple factors including the size of the gun and bullet type. Common questions with fairly simple answers that we will cover in this article. In very simple terms, subsonic means the bullet is moving slower than the speed of sound. Supersonic means the projectile breaks the sound barrier, which produces a mini sonic boom, or a sonic crack. The speed of sound is a variable thing that is affected by temperature, humidity, and barometric pressure.
However, the generally accepted answer for the speed of sound at sea level, is about feet per second. Anything above that risks entering the trans sonic barrier. Subsonic ammunition is loaded specifically for the projectile to maintain a speed that does not break the sound barrier and create a sonic crack.
However, by using a heavier bullet — such as a gr or gr — and changing the load, the 9mm round can successfully be made subsonic. Obviously, subsonic ammunition is ideal for use in a firearm equipped with a suppressor. The loud sound when firing a gun comes from 2 sources: First is from the pressurized gases created in the chamber and escaping through the barrel.
This is addressed by using a suppressor or silencer which, simply put, gives the gasses a larger chamber in which to cool and dissipate before exiting into the atmosphere.
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