barrel length vs accuracy?

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

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ELDudarino
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barrel length vs accuracy?

Post by ELDudarino » Mon Jun 06, 2011 6:53 pm

Howdy all,

I am trying to decide on what lenght barrel to include in my future build. I understand the 300 blackout is designed mainly as a pdw round, however I do enjoy shooting distances.

Does a 9 or 10 in barrel maintain sub 2 moa accuracy at 300 yards? How does it compair to a carbine and rifle lenght barrel? I ask because I want to go SBR with suppressor, but I do want to be able to reach reliably when needed.

Thanks for the help

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Re: barrel length vs accuracy?

Post by HotLead » Mon Jun 06, 2011 7:58 pm

Your barrel length has very little to do with accuracy. Just pick a good quality barrel, or blank if you will have it custom built, and choose the appropriate bullet weight for the rifling and it should be fine.
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300Blk
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Re: barrel length vs accuracy?

Post by 300Blk » Mon Jun 06, 2011 9:16 pm

All of the 16 inch barrels we have tried have been significantly more accurate than the short barrels for supersonic bullets. For subsonic it does not seem to matter much.

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Re: barrel length vs accuracy?

Post by 82nd airborne » Mon Jun 06, 2011 9:55 pm

Alot of times short barrels can even outdo long barrels due to having more regidity. Barrels are voodoo.
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Re: barrel length vs accuracy?

Post by 300Blk » Mon Jun 06, 2011 10:21 pm

Yeah, a 16 can outshoot a 26 but it is hard for an 8 to outshoot a 16.

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Re: barrel length vs accuracy?

Post by copenhagen » Mon Jun 06, 2011 10:58 pm

But I have a 7" barreled 7.62x39 rifle that will put wolf 123 grain FMJs in a quarter all day long at 100 yards. I have never ceased to be impressed with that thing.

Robert, do you have any idea/theory as to why the Subsonic 300 Blackout is more accurate than the Supersonic out of the shorter barrels?

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Re: barrel length vs accuracy?

Post by 82nd airborne » Tue Jun 07, 2011 8:37 am

regidity, harmonics, drag, on and on. Almost every Encore or contender I have shot is more accurate as a pistol.
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Re: barrel length vs accuracy?

Post by 300Blk » Tue Jun 07, 2011 8:37 am

I think that the higher muzzle exit pressure of supersonic ammo, and the higher pressure of short barrels, flips the bullets off at an angle. It seems to effect boat-tails more than flat base, and shorter bullets are not effected as much.

As for quarter-size groups - our 9 inch barrels can do 1.25 inch 5-shot group averages, which is larger than a quarter, but still ok.

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Re: barrel length vs accuracy?

Post by copenhagen » Tue Jun 07, 2011 11:16 am

That sounds more than good enough for the weapon's intended purpose. I was quite impressed by the sound, or lack thereof, at the shoot of your 300 Blackout Subsonic round. Wish I would have talked to you a bit more, but wasn't sure it was you until later.

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Re: barrel length vs accuracy?

Post by Dr.Phil » Tue Jun 07, 2011 1:27 pm

I've been amazed at the accuracy that I'm getting with my 10' Noveske barrel both with subs and light, flat based super sonic rounds.
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