![]() ![]() And also tell me what to buy and how much to pay for it. Maybe next time, you tell me what is OK to like and not like. I am allowed to say I don't like trailboss right? Or has the Democrat party taken over reloading too and I can't say that or have an opinion. Subsonic in 5.56 is almost useless as you guys know. I wanted to see how linear the progression of velocity was until it cycled the gun. So now, I learned what charges will get me subsonic with prettty much any pistol powder, since the 10 powder sampling covers almost the entire range with comparable powders.Īlso, the Blue dot going UP, had nothing to do with subsonic. I never did that test before, that was first time out with pistol powders in 5.56 cases. As you can see, I could care less about load data from manufacturers so that doesn't matter to me. Unique? 10/10.īUT, if you won't load anything except following manufacturer load data, than Trailboss is great, and I understand that, for those folks. If versatility is why you like certain powders, like why people like UNIQUE for example, then by that measure, objectively, Trailboss is the worst pistol powder you can buy. For example, 9MM it doesn't work, and also, you should not compress trailboss. Good luck if you test this load data and let me know how it works for you.I don't like trailboss because it has "narrow" versatility. 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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