Good luck if you test this load data and let me know how it works for you. The Alliant powder seemed a little quieter than the IMR powder. There is still a lot of gas coming out of the ejection port. These loads were not particularly quiet suppressed. I needed to load these rounds with a COL of 2.260”. Also, before you test any load shoot it on paper to make sure your rounds are not keyholding without a suppressor. You need the extra pressure the suppressor provides. Note, you must use a suppressor to get the bolt lock open. I suspect this load will produce somewhere around a 1.5 – 2 MOA grouping. I did a quick 4-shot test to take a look at the accuracy. Here’s the grouping of the IMR load from 25 yards. Note, you will probably have to tweak the load data to your specific firearm. This is the AR I used with a Mystic X suppressor. The standard Gas Hole Diameter of 0.070” works fine. You will need a 1:7 twist barrel at least 16” long with a carbine gas port. I was able to get both Alliant 2000-MR and IMR 4227 working. Outlaw State Bullets recommended a load using IMR 4227 for a cycling AR subsonic round. They make a hollow point bullet that will expand at low velocities. That was the only place I found that manufactured anything over 100 grains. 224 bullets from Outlaw State Bullets LLC. The powder in the Atomic load looked very similar to Alliant 2000-MR, so that’s where I started. The bullet is 112 grains and the primer looked like a Winchester small rifle primer. I took apart the cartridge and what I found was they are using 15.6 grains of a fine flattened ball powder. To accomplish this, you need to get some extremely fast burning powder like titewad or tight group shotgun powder.Obviously you need a heavy bullet for cycling an AR 223. 223 ammo 24253 Views 5 Replies 4 Participants Last post by Matchking Man, Matchking Man Discussion Starter The clue the Atomic ammo gave me was they figured out how to get enough pressure at low velocities to cycle the bolt. The Atomic sub ammo gave me around 1150 FPS from the 10.5” barrel and around 1500 FPS from the 16” barrel. The ammo cycled and locked the bolt open in both the 10.5” and 16” barrels. I could not get the Atomic subs to stabilize with my fast twist 1:7 10.5” or 16” 5.56 NATO barrels. I had high hopes for the sub ammo, but it didn’t work. I ended up purchasing some Atomic Tactical Cycling 5.56 NATO Subsonic Ammunition from Midway at $60 for a box of 50. Some of the load data posted that claimed to cycle an unmodified AR did not work for me. It seems a few others have tried this and ended up not having much luck either. I tried to find some load data but had no luck. 223 subsonic load working with a standard AR15 platform that cycles. It was very cool to have a mouse-fart load though.For the past 7 months I have been trying to get a. Right now it is just a way to fight the summer heat doldrums. I don't know how motivated I am to pursue this type of development if I need to find components other than what I already have. Many other people are using Trailboss as a powder as it has more volume to it to fill the case capacity better. I already have 68gr Hornady Match bullets but don't know if that is heavy enough to get my action to cycle. Since keeping the bullet subsonic is a fixed factor the only variable to develop enough pressure to cycle the action is by using a heavier bullet. From my research on the subject instead of working charges from low to high this type of development works in the other direction as the concern is more about making sure that the bullet has sufficient velocity to clear the barrel. I'll probably revisit this project with a 68gr bullet to see if it gets more response out of the action. We worked it up to 3.4gr but still didn't hit the advertised 1046fps. The Hodgon website shows 3.1gr of Titegroup but you need to confirm you own load data, as always.
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