Then, WITHOUT A SUPPRESSOR, fire a group at 25 yards to ensure the bullets do not yaw or tumble in flight. As a rule, make sure that the suppressor is at least 0.025 inches in diameter larger than the diameter of the bullet(0.224”). If the twist rate is slower than 1 in 9 inches, we do not recommend firing Atomic’s 223 Subsonic through your rifle. That depends on the firearm and the twist rate of the barrel to ensure adequate gyroscopic stability of the bullet after it leaves the muzzle, suppressor alignment and inner diameter of the suppressor. Is ATOMIC 223 SUBSONIC safe to shoot through my rifle/suppressor? ATOMIC Ammunition’s standard subsonic rifle ammunition could but is not specifically designed to cycle semi or fully automatic weapons. I has to be loaded with pistol powder.Ītomic Ammunition’s TACTICAL CYCLING SUBSONIC products are specially designed to cycle semi and fully automatic firearms when used in conjunction with a suppressor. 224 projectile would even be close to stabilized in a 1n7 twist. Good luck if you test this load data and let me know how it works for you.Not for me. 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. Obviously you need a heavy bullet for cycling an AR 223. 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. For the past 7 months I have been trying to get a.
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