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6.5 STW barrel

 
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  #1  
Old 12-28-2011, 01:08 PM
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6.5 STW barrel

Will be having one made very soon and looking for info on what twist I should use? Plan on shooting 140-142 grain bullets.
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Old 12-28-2011, 02:28 PM
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Re: 6.5 STW barrel

An 8 should do it for most.
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Old 12-28-2011, 03:21 PM
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Re: 6.5 STW barrel

A 1-8" will definitely do it, look around for a stability calculator. With the velocity potential I wouldn't be surprised if a 1-8.5" or even a 1-9" wouldn't work (better).

I just bought a 1-8.4" Obermeyer for my 6.5WSM.

No, I don't know why he made them 8.4
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Old 12-28-2011, 04:40 PM
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Re: 6.5 STW barrel

I have a 1-8.5" on my 6.5-06AI and it stabilizes 140 AMaxes easily, even at the low accuracy node ca. 2650 fps. With your velocity, I'd think a 1-9" twist would work fine, and a 1-8" won't hurt anything...

Have fun,

Brian
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  #5  
Old 12-28-2011, 04:47 PM
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Re: 6.5 STW barrel

You might seriously consider the slower twist, after you get some rough spots in the throat you could start dusting the light jacketed bullets like the Berger Hunting VLD. (if you plan to use them), if not the CEB's & SMK's will hold up to a 1-8" just fine, I don't know about the A-Max.
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  #6  
Old 12-28-2011, 05:24 PM
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Re: 6.5 STW barrel

Berger recommends an eight for their 140's.
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  #7  
Old 12-28-2011, 05:35 PM
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Re: 6.5 STW barrel

Quote:
Originally Posted by Loner View Post
Berger recommends an eight for their 140's.

With the Target VLD's there won't be any problems & there probably won't be with the Hunting VLD's for the first couple hundred rounds.... a 5R bbl would help too.

I'm not saying that it won't work, I just trying to point out what could (& has) happen. At the velocity of the STW, the Hunting VLD are going to spinning VERY quickly, with a rough throat, tight twist & high velocity bullet separation is a real possibility.

I would enthusiastically recommend the 1-8" for a 260(ai) or 6.5 CM or anything under the 264WM... but in this case a 1-8.5 or 9 may be better.
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