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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52067
Real Name: Steve
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Unburned powder = muzzle flash. I'm failing to understand the problem.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Thu Jan 11, 2018 9:44 pm |
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RocketScott
Site Supporter
Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11097
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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.
_________________ You may be right, I may be crazy, but it just may be a lunatic you're looking for
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Thu Jan 11, 2018 9:51 pm |
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RocketScott
Site Supporter
Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11097
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MadPick wrote: Unburned powder = muzzle flash. I'm failing to understand the problem. More junk building up in the can
_________________ You may be right, I may be crazy, but it just may be a lunatic you're looking for
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Thu Jan 11, 2018 9:52 pm |
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beckdw
Site Supporter
Location: Tri -Cities Joined: Thu May 23, 2013 Posts: 2798
Real Name: David
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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.
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Fri Jan 12, 2018 9:26 pm |
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OhShoot!
Site Supporter
Location: Bellingham Canada Joined: Thu Jan 3, 2013 Posts: 4999
Real Name: Josheewa
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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.
_________________ It must be frustrating always being the smartest person in the room.-Jagerbomber35
Divided we fall.
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Fri Jan 12, 2018 9:58 pm |
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Yondering
Site Supporter
Location: Skagit County, in the woods Joined: Tue Apr 7, 2015 Posts: 1058
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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.
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Fri Jan 12, 2018 10:49 pm |
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beckdw
Site Supporter
Location: Tri -Cities Joined: Thu May 23, 2013 Posts: 2798
Real Name: David
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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.
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Sat Jan 13, 2018 7:13 pm |
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Waw44
Location: Seattle Joined: Thu Aug 3, 2017 Posts: 93
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Resurrecting an old thread. Does anyone have experience with 300AAC without a suppressor in a PSA 8.5" stock upper? I'm thinking of one of their upper kits to build my first AR pistol.
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Tue Oct 02, 2018 5:29 pm |
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RocketScott
Site Supporter
Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11097
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I don't recall the exact specs of my upper but you should be fine with what they put together
You might need to swap the buffer out, that's all I did to get mine running well. No adjustable gas block needed
_________________ You may be right, I may be crazy, but it just may be a lunatic you're looking for
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Tue Oct 02, 2018 5:38 pm |
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beckdw
Site Supporter
Location: Tri -Cities Joined: Thu May 23, 2013 Posts: 2798
Real Name: David
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My dad has the PSA 8.5" 300 Blackout pistol. Runs like a top at 1050fps with 10.5gr of AA1680 under a 203gr bullet.
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Tue Oct 02, 2018 10:01 pm |
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