Powders for subsonic 300 AAC Blackout?

Discussion in 'Handloading and Reloading' started by Legionnaire, Mar 12, 2014.

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  1. Legionnaire
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    Legionnaire Member

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    So I'm dipping my toe into the 300 Blackout waters. I'm not looking to feed an AR at this point; rather, I'm starting with a 16.5" barrel for my Encore. Have brass, dies, bullets ... I'll likely start with some 190 grain Sierra's since I have a lot of them available. I plan eventually to add a suppressor.

    So what powders do you find best for subsonic loads?
     
  2. oldpapps

    oldpapps Member

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  3. Legionnaire
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    Legionnaire Member

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    Great link; thanks.
     
  4. RussellC

    RussellC Member

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    I've been told Accurate 1680 is the bee knees for this in 300 BLK OUT. Hope its true, I had a chance to buy an 8 pounder and jumped. It is said loads with this powder can get fairly low and still operate the action. I will be finding out soon, at least unsuppressed. Suppression will have to wait for $$$.

    Russellc
     
  5. HisStigness

    HisStigness Member

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    Most of the load data I found on the internet before I got into 300blk used H110, so that's what I ended up using. I have loaded from 110 to 220 grains and have never had the cycling issues some people have reported while shooting subs.
     
  6. cfullgraf

    cfullgraf Member

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  7. Lennyjoe

    Lennyjoe Member

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    Am using 1680 and have LilGun on the sidelines.
     

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    Last edited: Mar 12, 2014
  8. bluetopper

    bluetopper Member

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    You think the 300 BLK is a passing fad? Shooting it leaves me wanting.
     
  9. cfullgraf

    cfullgraf Member

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    Different strokes for different folks, but 300 BLK is in my arsenal to stay.

    I enjoy shooting mine and, in my opinion, it makes a dandy home defense rifle.
     
  10. redbullitt

    redbullitt Member

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    Since you don't have to worry about cycling you can have some fun lol.

    You don't really need that AA 1680 for a bolt rifle. Its whole purpose is to get a pressure curve appropriate for the ar15. It tends to be much louder than necessary in a bolt rifle, but it will work just fine if its what you have.

    Lil gun and N110 give me the best results from my 300whisper bolt. 180-250 grain bullets do very well. Accuracy is very good and very consistent. H110 is viable here too, but is said to be temperature sensitive.

    American select and red dot give me good results with the lighter bullets, say 160 or lighter. Accuracy is adequate at under 3 moa at 100 yards. They are VERY quiet even without a suppressor. Unique and the other pistol powders can give good results here as well.

    Just be careful since pressure can rise very fast with these powders compared to slower ones.

    A bolt or break action 300blk or whisper is an excellent rifle. Subsonics are quiet, cheap, economical, AND you can get components even when stuff is scarce. Super sonics can kill deer, work for self defense, and are great for all around use.

    You will ALWAYS be able to find components to shoot something out of that rifle. It uses a 30 caliber bullet…. SUPER common. You can run most pistol powders, mag pistol powders, and even the fast rifle powders with decent results. Both small rifle std and mag rifle primers can be used, as well as small pistol std and mag primers depending on your load. The rem 6.5 primers even work on low pressure loads. Brass is 223 cut down, something we can find even now at the range for free many days.

    You can shoot for next to nothing with a charge of red dot and a 150g cast bullet.

    I really see no down side to it. Another great one is the 357 mag case necked to 30 caliber (great in break action btw)… AND this just gives you a rimmed 300 blk lol.
     
  11. Rushthezeppelin

    Rushthezeppelin Member

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    1680 and 4227 seem to be the gotos when it comes to subs. Be careful with using H110 as with it filling so little of the case sometimes the flash hole can become exposed if the powder settles horizontally causing your entire load to ignite at once causing overpressure.
     
  12. GarrettJ

    GarrettJ Member

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    I had been shooting .300 Whisper in a Contender for several years before AAC rebranded it as the 300BLK. For a manually operated firearm, I find you can run a much faster powder than what will work for a gas operated gun.

    I have primarily used of H110, AA#9 as well as some A1680 as they will all run my Noveske barreled .300 FB. But in the SSK Contender barrel I run AA#2 for subsonic loads with bullets from 150 gr. to 220 gr. and Trailboss for 73 to 100 gr. bullets.

    For the first set of powders listed, AA#9 is quietest when shooting suppressed, followed by H110, and A1680 is loudest.

    Both of the faster powders sound good, but TB fills the cases fuller.

    103_5732.jpg
     
  13. Legionnaire
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    Legionnaire Member

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    Love the look of that Contender! Did you "SBR" that one, or is the can permanently attached? Other? Inquiring minds would like to know! And thanks for the info.
     
  14. Legionnaire
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    Legionnaire Member

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  15. Hyrulejedi86

    Hyrulejedi86 Member

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    Hey Garrett, What gr bullets are you shooting under your AA#9? I'm planning on getting a 16" bolt action and an 8-9" AR pistol and I'd like to only have to load one subsonic load to shoot through both. I want to use the xtreme 150 gr because they are so cheap but I'm wondering if they will cycle with AA#9 in an AR? I also would like as quiet as possible so it sounds like A1680 that I was planning on using isn't the best in this case. I've been reading on the 300 blackout forum for a while now but I figure it can't hurts to ask! Thanks
     
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