I just changed out the upper on my M&P AR15OR to the 300 AAC Blackout. With just a bit of fiddling around its shooting 110 gr bullets pushed by H110 and grouping less than an inch at 100 yards and about 1.75 at 200 yards The Upper is an Anderson setup with the No Lube Needed receiver. I have been told H110 is not a good powder for use in the AAC 300 but it puts the rounds where you want them. Anyone else use a 300 Blackout with H110? The wife shot it a few times and now I have to put her a 300 Blackout together. She already took my other AR15 in 5.56 off me.

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Army 1967-77
USAF 1978-2000

You needed an excuse to build another one. You are lucky she goes shooting with you!

Who told you that? It's about all I use. I'd consider it an excellent powder for 300 BO.

H110 is the preferred powder if you look on the reloading sites. Also, Nosler highly recommends it.

The 300blk round is a fantastic round, I just wish I could buy it cheaper. Congrats on discovering it!

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Still carrying my S&W 642

H110 is not ideal for heavy bullet subsonic loads in AR's. it is tough to get load that stays reliably subsonic and will cycle the action. But other than that H110 is excellent in the Blackout as others have said.

hahahahaha that's hilarious! She already took your 5.56 AR. That's awesome!

I'm happy that you are enjoying your new 300 AAC Blackout upper.

H110 was originally developed to load the M1 Carbine and if you look at the performance, that is essentially what the Blackout is. And since everyone I know who has an M1 Carbine finds it a joy to shoot, I'm not surprised that the 300 AAC Blackout is is delivering similar satisfaction.

It fires the 100 and 110 grain bullets at velocities about 10% above the M1 Carbine (a cartridge universally derided as "anemic") and 230 grain bullets at about the same velocity as can be attained from .45 ACP ammunition. You'll forgive me if I find it difficult to understand how "hobbling" a high velocity rifle to bring it into M1 Carbine territory somehow make it "ideal".

It fires the 100 and 110 grain bullets at velocities about 10% above the M1 Carbine (a cartridge universally derided as "anemic") and 230 grain bullets at about the same velocity as can be attained from .45 ACP ammunition. You'll forgive me if I find it difficult to understand how "hobbling" a high velocity rifle to bring it into M1 Carbine territory somehow make it "ideal".[/QUOTE]

Trying to get 223 subsonic is problematic, so J.D. Jones developed the 300 Whisper along with an silencer/suppressor system for the AR. Mr. Jones patens ran out not to long ago and an identical cartridge appeared without any credit given to J.D.

As to the superiority of the 300 Blackout, over 45ACP as a subsonic carbine round; There really isn't any. If you load 250 grain bullets in ACP you get even more energy. But the DeLisile carbine of SAS, WWII fame proved that 45 ACP was sufficient for sentry removal at 200 meters. So the 300 Blackout should have similar results. The real problem is finding a 45 ACP Carbine that can be easily silenced.

I even worked with 30 Carbine with 200 and 220 grain subsonics, back in the 80's (No Joy!).

You can't get 200 grain (for 35 Remington) 9mm projectiles to leave the barrel without blowing up the brass. Then you have a twist/stability issue to contend with.

So that leaves the 300 Blackout as what is available/practical. (although the Chinese had pretty good luck with a silenced 30 Tokarev pistol with a 147 grain AK projectile. That would be a even shorter version of the 300 Blackout.)

Personally, I just use standard 5.56 NATO with a suppressor, and sounds like a 22 Stinger. It still behaves like a normal 5.56 all the way to 600 meters, BECAUSE IT IS!

Ivan