So based on the limited data given by the manufacturer (+/-10 fps) (i don't know how many samples to give adequate statistical analysis), but lets say the +/-10 fps is 3 sigma up or down, (also assuming normal distribution) which means 99.7% of all rounds will fall in the 1060 +/-10 fps range, so reality their rounds would be consistently subsonic at or below 1070 fps. It won't matter the elevation as temperature has the impact on speed of sound (humidity will have a small impact on speed of sound). the speed of sound at 8 degrees F is 1060 FPS. Its nice bulky powder.Those rounds would remain subsonic as long as the temperature is at 9 degrees F or warmer. Trailboss is your friend when trying to get the 308 slowed down to 1025. Yes, it was quieter with a 24" barrel, bolt gun setup than the 8" semi.
And yes, I had to try subsonic rounds in my 308, even though I have the 300 blk. The 22 cans with subsonic ammo and a bolt rifle will run in the neighborhood of 109db. I have another 30 cal can in the wait as well because I was tired of sharing the Saker for 4 guns, it seemed to make sense to get another 30 cal can, so I can pretty much dedicate my Saker to the 300blk SBR that I built. Then realizing how expensive plinking with 300blk is, and wanting to do more play time with subsonic stuff that is cheap to shoot, caused me to start building a 9mm AR that im still waiting on the suppressor for. I started with a Sparrow, then a Saker that I run on my. Once you get past all the hoopla to getting one in your possession and you play with it a bit, you will want another, then another. The bad part is that suppressors are addictive. I guess a 300blk upper is the next thing to build. I was just curious as to how quiet one could make a 556 round with it still being able to cycle reliably. 22lr, which are fairly inexpensive, but make sure you get one that can be taken apart and cleaned, but that is another story. Next up, sounds like your ready for your second suppressor for a. 223 Subsonic Load Data and that will get you running. All of this is variable depending on a million things.Ī good place to hang around for knowledge about suppressors and load data is over on SilencerTalk. With the heavy 30 cal bullets, the rifles can be tuned to run both supersonic and subsonic ammo reliably and the subsonic type tend to be very quiet, like 119-123 db level, while supers run around 132-135. 223 AR, which causes them to build a 300blk next.
In one of my AR's, I don't have an adjustable gas system on it, so I run an 8 oz buffer to slow stuff down, If I could have made it 10oz, I would have.Ī lot of people are usually not happy with the level of suppression on a. You really should be running a heavier buffer also. If you have an adjustable gas system, turn it down until the gun stops cycling, then open it up just enough to make it cycle reliably. If you are going to start running a suppressor on your AR and are running it with supersonic loads, please keep in mind that you are increasing the backpressure on the system a lot and if you don't make a couple of changes to your rifle, you can shorten its life significantly. The bullet breaking the sound barrier is louder than 140db which is why most like to shoot subsonic bullets to make the platform quieter. 223 with a good suppressor are going to run in the neighborhood of 137-140 db, which is hearing safe, but still uncomfortable to my ears. As a novelty, yes, you can load up a few and keep them around for fun, or showing off at how quiet you can make it, but your rifle will likely be turned into a single shot and you will have to manually cycle the action to load the next round every time. Its likely that it will be almost impossible to get your AR to cycle reliably at all with subsonic loads unless you build the gun for that purpose. I have to ask why you want a subsonic 223 round though as you are turning your center fire rifle into a. First, welcome to the world of suppressors.
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