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 PSA 300 AAC 
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Unburned powder = muzzle flash. I'm failing to understand the problem. :bigsmile:

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Thu Jan 11, 2018 9:44 pm
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OhShoot! wrote:
I read that 300 BO was designed for a 10.5-11 inch barrels. Might be why people are getting unburned powder in the shorter 7.5-8 inch barrels.


This guy says 9":

http://www.thetruthaboutguns.com/2014/11/foghorn/ask-foghorn-questions-300-aac-blackout-rifle/

That's about what I had read from other sources too when I built mine, around 8-9". I went with 8.5" since KAK had a bunch on sale.

Right now I'm just shooting S&B 200grn but will start reloading with Berry's bullets once I have enough brass collected.

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Thu Jan 11, 2018 9:51 pm
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MadPick wrote:
Unburned powder = muzzle flash. I'm failing to understand the problem. :bigsmile:


More junk building up in the can

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Thu Jan 11, 2018 9:52 pm
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RocketScott wrote:
beckdw wrote:
Guns4Liberty wrote:
Does anyone with a 7.5" or 8" barrel have issues with incomplete powder burn on .300 AAC BLK subs? I know that's an issue with short 5.56 barrels, but not sure if it would be different for .300 considering the loads are quite different.
Do I ever. I was considering starting a thread on it. I get a lot of powder all over the inside of the ARs. Yet, I lose velocity if I back off the charge...wtf?


What powder are you using?

Probably need something that burns faster. All 300BLK that I've seen use pistol length gas systems. Not a lot of time to burn everything up.
I run AA1680 because that is the only powder that I have found that will cycle my loads in the 7.5". I'm considering trying magnum primers to see if I can get all the powder to burn.


Fri Jan 12, 2018 9:26 pm
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beckdw wrote:
RocketScott wrote:
beckdw wrote:
Guns4Liberty wrote:
Does anyone with a 7.5" or 8" barrel have issues with incomplete powder burn on .300 AAC BLK subs? I know that's an issue with short 5.56 barrels, but not sure if it would be different for .300 considering the loads are quite different.
Do I ever. I was considering starting a thread on it. I get a lot of powder all over the inside of the ARs. Yet, I lose velocity if I back off the charge...wtf?


What powder are you using?

Probably need something that burns faster. All 300BLK that I've seen use pistol length gas systems. Not a lot of time to burn everything up.
I run AA1680 because that is the only powder that I have found that will cycle my loads in the 7.5". I'm considering trying magnum primers to see if I can get all the powder to burn.

Magnum primers sound like a great idea.

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Fri Jan 12, 2018 9:58 pm
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I like the 300 Blk and load a lot of it, but 7.5" is shorter than I want. My first AR (back when the 300 was new) was an 11" 300 Blk, which I later shortened to 9". 9" works pretty well, but lost some significant velocity from 11" with supers; more than I expected based on the numbers posted online.

For subsonics only, it doesn't matter too much, except that it'll be a little louder for a given suppressor and load than a longer barrel would be.


Fri Jan 12, 2018 10:49 pm
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OhShoot! wrote:
beckdw wrote:
RocketScott wrote:
beckdw wrote:
[quote="Guns4Liberty"]Does anyone with a 7.5" or 8" barrel have issues with incomplete powder burn on .300 AAC BLK subs? I know that's an issue with short 5.56 barrels, but not sure if it would be different for .300 considering the loads are quite different.
Do I ever. I was considering starting a thread on it. I get a lot of powder all over the inside of the ARs. Yet, I lose velocity if I back off the charge...wtf?


What powder are you using?

Probably need something that burns faster. All 300BLK that I've seen use pistol length gas systems. Not a lot of time to burn everything up.
I run AA1680 because that is the only powder that I have found that will cycle my loads in the 7.5". I'm considering trying magnum primers to see if I can get all the powder to burn.

Magnum primers sound like a great idea.[/quote]Yeah, the nice thing about subs is you don't have to worry about pressure as much.


Sat Jan 13, 2018 7:13 pm
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