Shortest 300 blk barrel

Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge.

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PNW17
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Re: Shortest 300 blk barrel

Post by PNW17 »

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Now just need to drill the gas port and mount to an upper I have being shipped my way.
PNW17
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Joined: Mon Jul 17, 2017 6:14 pm

Re: Shortest 300 blk barrel

Post by PNW17 »

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Reaming gas port to .109 (7/64) after drilling undersize.
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gds
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Re: Shortest 300 blk barrel

Post by gds »

looking good
Yes, I am a Baptist, and yes I carry a gun. You might think I carry a gun because I don't trust God. Well you would be wrong. I have complete faith in my Lord. It is mankind I have no trust in
PNW17
Senior Silent Operator
Posts: 135
Joined: Mon Jul 17, 2017 6:14 pm

Re: Shortest 300 blk barrel

Post by PNW17 »

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Blued and oiled. The gas port is about 1” ahead of the top of the neck of the brass in battery or the start of the throat. It’s about 2” back from the front of the barrel. Now waiting for parts....
PNW17
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Re: Shortest 300 blk barrel

Post by PNW17 »

Got the upper in and put it together. Took it to the range with the chrono. Ran some Rainier 110gr over trailboss that are subsonic in my contender to see if they would cycle. They did not. They ran straight though and did not keyhole so my first real crack at threading a barrel was successful. Ran some acme 265 reds over about 11 grs of N120. They cycled but spit out a bunch of unburned powder and averaged 675 FPS. No go. Ran some Rainier 180’s over 11 grs of N120. Same deal, spit out unburned powder. Put in some Rainier 180’s loaded short for my RARR over 5.5 grs of Accurate #5

Wow. Close to Zero recoil, super quiet, accurate.

That fast powder was amazing. It ran like a Swiss watch. And at 750 FPS. I will do a ladder test upwards to get closer to 950 FPS but this ran amazing as is.

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dellet
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Re: Shortest 300 blk barrel

Post by dellet »

That looks real nice, and very good to hear it works.

Look forward to the range report.
300 Blackout, not just for sub-sonics.
BlogSarge
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Re: Shortest 300 blk barrel

Post by BlogSarge »

I’m enjoying reading the saga. Thanks for pushing new limits and sharing your journey.
PNW17
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Re: Shortest 300 blk barrel

Post by PNW17 »

I am going to ladder test the accurate #5 and also vary the COL. I have Acc #2 and will try that as well, that should be quieter and faster.
PNW17
Senior Silent Operator
Posts: 135
Joined: Mon Jul 17, 2017 6:14 pm

Re: Shortest 300 blk barrel

Post by PNW17 »

Also have a fixed barrel adaptor coming in that will shorten the suppressor by about 1.5”. Should make for a compact unit.
2manyToys
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Re: Shortest 300 blk barrel

Post by 2manyToys »

Is the can a Liberty Mystic-X?
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