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PSA 300 AAC
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Site Admin   Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52032 Real Name: Steve 
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Unburned powder = muzzle flash. I'm failing to understand the problem.
 _________________ Steve Benefactor Life Member, National Rifle Association Life Member, Second Amendment Foundation Patriot & Life Member, Gun Owners of America Life Member, Citizens Committee for the Right to Keep and Bear Arms Legal Action Supporter, Firearms Policy Coalition Member, NAGR/NFGR Please support the organizations that support all of us. Leave it cleaner than you found it. |
| Thu Jan 11, 2018 9:44 pm |
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Site Supporter   Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11088
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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 |
| Thu Jan 11, 2018 9:51 pm |
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Site Supporter Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11088
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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 |
| Thu Jan 11, 2018 9:52 pm |
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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. 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. |
| Fri Jan 12, 2018 9:26 pm |
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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. 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. Magnum primers sound like a great idea. _________________ It must be frustrating always being the smartest person in the room.-Jagerbomber35 Divided we fall. |
| Fri Jan 12, 2018 9:58 pm |
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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. |
| Fri Jan 12, 2018 10:49 pm |
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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. 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. 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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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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Site Supporter Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11088
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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 |
| Tue Oct 02, 2018 5:38 pm |
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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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