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300 Blackout 1:7 vs. 1:8
 Moderated by: Slingshot, Rockydog, klallen, DesertMarine, -6
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 Posted: Thu Jan 3rd, 2013 06:06 PM
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zMot
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I'm ready to make this jump, but wanted to see if anyone here would like to have a technical discussion on the pro/con aspect of the barrel twist.
The plan is to build one, with a barrel length between 10.x" & 12.x", with and without a suppressor, of course. Will one twist stabilize & function both better than the other? Accuracy of both suppressed & unsuppressed is the objective.

thanks for your thoughts in advance
zMot



 Posted: Thu Jan 3rd, 2013 10:35 PM
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SavageShooter



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Not really a huge spread on twist rates for the 300 AAC, I think 1:7 through 1:8.5 is about all you can get. Regardless, both with shoot supers and subs just fine. I think if it were me, and I was building an SBR, I'd get the faster twist barrel. Just my 2 cents.



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 Posted: Thu Jan 3rd, 2013 10:53 PM
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zMot
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Thanks Savage, I was leaning that way. WIll probably go there unless someone can show a definite difference otherwise.



 Posted: Sat Jan 19th, 2013 07:46 AM
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shodan
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What purpose are you getting the 300 for? I am not as familiar with the 300 black out as some others, but with the option for having sub sonic rounds as well as supersonic rounds, are the manufacturers of this ammo reducing the velocity of the bullets by utilizing bullet weight, or charge strength? The twists of 7 and 8 are so close, there wouldn't really be any noticeable difference between the two, unless there was some kind of extreme involved... like shooting a super heavy weight bullet for the caliber real slowly, or shooting a super light for caliber bullet at a much higher speed. With those you would run the risk of having your bullet not stabilize, or having it disintegrate because of the twist being so fast, respectively.



 Posted: Sat Jan 19th, 2013 12:25 PM
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Reloader George
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The 1 in 7 twist is needed to stabilize the 240 grain bullets.  The 220 is tops otherwise.



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 Posted: Sat Jan 19th, 2013 02:33 PM
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shodan
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Thats what I was thinking of for the faster twist, but I don't know really how the cartridge is loaded, so a 7 twist is good for the 240 grain bullet, but is this cartridge being loaded fast with a bullet that's light like a 110 grain bullet? If you were to propel that weight bullet fast enough you could get into some integrity issues with the bullet jacket.

Other than that, I personally would always favor the faster twist.



 Posted: Wed Jan 23rd, 2013 11:57 AM
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snoshu
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Thats awesome I wish I had the knowledge and experience to do a project like that myself



 Posted: Thu Jan 24th, 2013 04:01 PM
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zMot
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Thanks for the responses & comments folks.
The intent of this rifle build is to make a Close Quarter Battle Rifle of my own, that will provide a platform for two handguard designs I've been working on for about 9 months. I'll share the results when I've completed the projects.
Thanks Again\z



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