It worked fine with heavy bullets right up until I was getting close to a max load (where the bullet went supersonic).The good news is there are a couple quick fixes to this problem. I guess that I should point out that Trail Boss may be OK, if you are satisfied with velocities well below supersonic. I very well might get back into playing with this. I would be highly interested in hearing what you guys come up with in terms of actual loads that you actually test. I was hot and heavy into it for about a month, proved that I could do it, saw how some of the loads performed and moved on to something else. To be honest, I sort of lost interest in the whole thing.
I only played around a little bit with the 100 grain bullets. It did seem to work OK with 55 grain bullets FWIW. I attributed my crazy velocity variation to that and quit messing with it. I went home and did some research and read somewhere that you can't compress Trail Boss. I found that before I got to where I wanted to be in terms of velocity that I ran out of room in the case for additional powder and when I compressed it, I got WILDLY varying velocities. I got decent groups at 25 yards and they were very quiet. I was working my way up to just below the speed of sound. I tried Trailboss powder right off the bat. After my last post, I just went out in my building and checked and I still have most of them. 224", BTHP bullets and I bought 1000 of them. 223 that I had was the 77 grain SMK, so that was what I mainly concentrated on but later on I came across some 100 grain. I should point out that when and where I was doing this, it was over 100 degrees every day, so I figured that if I came up with a load that was just below supersonic (every round below), then in the winter it would definitely be subsonic. These fly slower, and they also hit harder for a given fixed velocity. I also figured that if you were limited by velocity that you should maximize your efforts by using heavy bullets. My initial thoughts were that I wanted a load that was as close to being supersonic as possible, without actually being supersonic. But this was probably at least 10 years ago.
At the time, I posted extensively about my loads on a forum that I think was (is?) called Silencer Talk or something like that. I had the time, I had a range close to where I lived, and I owned a chronograph. So, when I was playing around with this, I was just winging it. About the time they started to become popular, I jumped on board.Īt the time, there was very little information out there about loading subsonic rifle ammo. Various people have always owned suppressors, but the average gun owner didn't know anything about them. I credit the internet and on-line gun forums for getting the word out that it is perfectly legal to own a suppressor, and it is not a difficult process. There was a time, not long ago, when suppressor ownership was not as common as it is today. I was shooting and other people at the range kept calling a cease fire so they could look at their targets and after the first few times I started playing with my phone. Ok, I made that last post from the range.
Third, no current sub-sonic rifle round will consistently cycle the action on gas operated weapons. Second, the reduced propellant charge creates lower pressures which makes consistent and complete case mouth obtuation (chamber sealing) difficult and makes it hard to get a clean burn of the propellant causing rapid fouling of the weapon. The inconsistent propellant distribution prohibits uniform ignition, thus significantly altering the burn profile.
#AR 15 SUBSONIC ROUNDS FULL#
First, they are not overly accurate due to large standard deviations in velocity from using a full sized cartridge case with a dramatically reduced propellant charge and a very heavy bullet necessary to reduce velocity below 1,100 Feet Per Second (FPS). Today, there is no sub-sonic ammunition currently type classified for use in the calibers provided by any DoD Service There are many contributing factors associated with currently fielded sub-sonic cartridges.
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