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1:8 or 1:9...

 
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  #8  
Old 11-10-2012, 08:27 PM
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Re: 1:8 or 1:9...

I am of the opinion that 1:8 is the perfect twist rate for a 223/556 AR15. That twist rate will work with EVERYTHING that will feed from an AR magazine.

My RRA Predator Pursuit rifle has a 1:8 twist. It will easily shoot inside the company's 3/4 moa accuracy guarantee with every bullet I have shot from the 40 grain varmint bullets to the 77 grain match bullets. In fact it works so well, I'm looking to re-barrel my bolt action 223 with an 8 twist barrel.
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  #9  
Old 11-11-2012, 06:10 AM
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Re: 1:8 or 1:9...

I've got a 7 twist in my AR and it shoots the 60V Max like a laser beam. Devastating on P Dogs.
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  #10  
Old 11-11-2012, 07:34 AM
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Re: 1:8 or 1:9...

The 1;9 will work in the 223 AI because of the increase in velocity especally with the heaver bullets

But for a strait 223/556 I would recomend the 1;8 twist for all bullets.

If you are going to shoot only the very large bullets then the 1;7 might be a better choice.

I rechambered a 223 in 1;8 to a 223 AI and it shoots under 1/10 th of an inch MOA.

The 1;9 is the preferred twist for the 45 to 55 grain bullets only.

J E CUSTOM
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  #11  
Old 11-11-2012, 08:49 PM
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Re: 1:8 or 1:9...

moa here with hornady and priv. partizan 75 grain bullets in a 9" twist dpms with factory peeps. I agree that the 8" twist is better for the heavier pills, but I've shot hundreds of 75-77 grain out of a 9" twist with no accuracy issues. They are all bullets that can be loaded to mag. length and aren't the tipped or long ogive pills
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  #12  
Old 11-11-2012, 11:17 PM
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Re: 1:8 or 1:9...

Quote:
Originally Posted by Lefty7mmstw View Post
moa here with hornady and priv. partizan 75 grain bullets in a 9" twist dpms with factory peeps. I agree that the 8" twist is better for the heavier pills, but I've shot hundreds of 75-77 grain out of a 9" twist with no accuracy issues. They are all bullets that can be loaded to mag. length and aren't the tipped or long ogive pills
when it comes to shooting 77/75 grain bullets in a 9 twist barrel, its hit or miss. A true 9 twist barrel won't work with a 75/77 grain bullets. the catch is that many barrels that are marked as 9 twist barrels are actually 8.5 twist barrels. thats why you hear conflicting stories about 75/77 class bullets in a 9 twist barrel.
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  #13  
Old 11-12-2012, 07:35 AM
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Re: 1:8 or 1:9...

Quote:
Originally Posted by rdsii64 View Post
when it comes to shooting 77/75 grain bullets in a 9 twist barrel, its hit or miss. A true 9 twist barrel won't work with a 75/77 grain bullets. the catch is that many barrels that are marked as 9 twist barrels are actually 8.5 twist barrels. thats why you hear conflicting stories about 75/77 class bullets in a 9 twist barrel.
I guess I've never checked the twist-- will do the next time I clean it as I suspect it may be faster than marked from what I've heard from you and others
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  #14  
Old 11-12-2012, 01:39 PM
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Re: 1:8 or 1:9...

The perils of buttoned barrels. I normally expect to see as much as +/- one inch from the stated twist in buttoned barrels. Unfortunately, it's sort of a crap shoot as to whether the variation will be on the "fast" or "slow" end of the listed twist.

Always opt for the faster of two twists if you think it's anywhere close to being marginal. Too fast a twist (even when it's a bunch too fast) will almost never cause a prblem; too slow a twist will ALWAYS case a problem.
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