As a side note, if a silencer is attached to the gun it will only suppress the muzzle-blast noise. Subsonic loads do not have this second component of noise. The noise that shooting makes has two components, the noise of the hot gases escaping the muzzle and sometimes flashing as they hit the atmosphere (muzzle blast), and in the case of supersonic loads the crack of the sonic boom as the bullet breaks the sound barrier. Most rifle loadings are all supersonic, so subsonic loads are specially down-loaded to stay below the speed of sound. In 9mm, most loading data are supersonic. All data in this caliber is subsonic but is not normally tagged with the name subsonic. Not all “subsonic” loads are noted as such in the data, because the cartridge is not capable of producing supersonic velocity. At least I'm hoping to test my AR pistol out with the 300 AAC barrel on it.Īnyway, still testing to see what load works.Subsonic loads refer to those whose velocity is less than the speed of sound. I wanted to make sure I would have some ammo in case I don't have time to load some before next weekend. OTFB and the other box I have is 120 OTFB. I picked up another box of Remington 300 AAC ammo today at Bass Pro, this was a box of 220 gr. I'm currently waiting on a couple things to complete my AR-pistol conversion to 300 AAC, I have some barrel nut shims coming that I've ordered and a small jig to cut the 223 cases down. It is convenient that I an use those bullets for supersonic loads of 300 AAC. BTHP and 175 TMKs as that is what I use for 308. AMAX bullets for subsonic, and would like to try some of those. I've read some good stuff about using 208 gr. I want to get some 1680 also, for subsonic. of W296 (same as H110) after a visit with a fellow calgunner today. I went with H110, which I got from a calgunner.įunny, I ended up with 5 lbs. I also found that none of my powders worked (which took some explaining to the spouse since I came home from a Miwall sale recently with over 30 lbs of powder). You could just go with a dedicated 9mm pistol upper and be done. I how ever agree with the others that say why bother with that. Īgain just thinking out load here I have zero experience with pistol AR's but believe I have a good understanding how the platform works. It would likely need to be highly customized for just that purpose. My point is I think it could be done but your not likely going to get any old pistol upper to work. Start playing with different combo's of all the above and I'd think you'd get something to work. That should push more gas down the gas tube pushing the BCG harder. Try a 10" barrel with a 5" gas system giving you an extra inch of dwell time. Lets say your 10" barrel has a 6" gas system leaving you with 4" of dwell time. Not sure where the gas port is on a 8" or 10" barrel. I'm thinking there are many things you can do to make it work really. I'm thinking a heavy bullet 75gr or 77gr maybe 69gr and a very slow pistol powder may do the trick. Let me start by saying I really have NO idea but here is my thought on this. ![]() So far nobody has answered the question of whether a 223 can cycle with subsonic ammo reliably or not. This is why I'm asking about the 300 AAC. While the 9mm AR pistol may be the best option, it won't be the most inexpensive for me. In terms of subsonic, I was mostly curious about getting an AR pistol down to that level at least as it would get me under 1300 fps, and even that is high for a handgun. Handguns are obviously more practical for that, and arguably an AR pistol in 9mm may be the best option, but I would like a better round than 9mm. I'm more so trying to figure out a way to bring the FPS down to a more manageable level inside of a home, so there is less danger is penetrating walls and hitting someone in another room. ![]() Nothing to do with sound, as I can't have a suppressor anyway. May I ask why you want to want your home defense gun to be subsonic? Unless you're shooting with a suppressor, intentionally downloading your ammo has just about no possible benefits.
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