1:11 twice rate barrel for supers only

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

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Cpt80
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1:11 twice rate barrel for supers only

Post by Cpt80 » Tue Nov 19, 2019 11:38 am

I live in a restrictive state so sbr and suppressors are out of the question I have the opportunity purchase 1:11 twist rate polygonal rifling barrel blank and I was thinking about chambering it in 300 blackout for supers only my question is has it been done before well it increase accuracy going to a slower twist rate and reduce chamber pressure?

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dellet
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Re: 1:11 twice rate barrel for supers only

Post by dellet » Tue Nov 19, 2019 12:25 pm

Yes, not really, not due to the rifling.

Yes, it,s been done.
If you are a consistent 1/2-1/4 MOA shooter and that matters to you it will probably help to have the twist rate matched to the bullet you are planning on using. Some 150 grain bullets will not stabilize in a 1/11 at 2000 fps.
As far as pressure that will be effected more in the chamber and bore diameter than the style of rifling.

If you are only going to shoot short, light bullets you might even go with a 13 or 15 twist.
300 Blackout, not just for sub-sonics.

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