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338 twist rate, what are your thoughts?

 
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  #1  
Old 01-17-2008, 06:04 AM
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338 twist rate, what are your thoughts?

That 338 Edge has got me thinking so here it starts.
I'm starting to purchase the components to have one built. I have read some people are using 1:9, 1:9.4 and others 1:10 twist for their 338's.

I'll mainly be shooting the 300SMK's but might experiment with other bullets from time to time.

I would like to draw on peoples experience and knowledge. What advice can you send my way?

Thanks
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  #2  
Old 01-17-2008, 08:35 AM
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I read an article where guys were able to stablize the 300gr SMK's with a 1:11 twist (factory Accuracy International barrel) they'd used them out to 1600yds. I'd imagine you'd be safe with sierra's recomended minimum 1:10 twist.
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  #3  
Old 01-17-2008, 09:57 AM
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I used 1:9.4 twist rate on my 338Edge, and far now the best group at 200yards is 0.25inch with 300SMK.

Chris
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Old 01-17-2008, 09:36 PM
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Building a large number of 338 LAIs and 338 Edge and Edge AIs I have found that 1 in 9.5 or 9.4 guarantees stabilization of the 300 gr SMKs.
Many claim 1 in 10 is enough, I found it to be borderline.
I shoot my 338LAIs out well beyond the 1 mile mark with the 300s and as 300RUM posted, the accuracy is pretty good.
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Old 01-17-2008, 10:15 PM
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Quote:
Originally Posted by long ranger View Post
Building a large number of 338 LAIs and 338 Edge and Edge AIs I have found that 1 in 9.5 or 9.4 guarantees stabilization of the 300 gr SMKs.
Many claim 1 in 10 is enough, I found it to be borderline.
I shoot my 338LAIs out well beyond the 1 mile mark with the 300s and as 300RUM posted, the accuracy is pretty good.
So far I have tentatively ordered it in 1:9.5 but was curious if maybe there was an advantage or dissadvantage in going to a 9 twist.

Thanks for the replies!
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  #6  
Old 01-17-2008, 11:24 PM
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Quote:
Originally Posted by fozzy View Post
So far I have tentatively ordered it in 1:9.5 but was curious if maybe there was an advantage or dissadvantage in going to a 9 twist.

Thanks for the replies!
I tried a 1 in 9, found no advantage other than that 1/2 the time the bullets came apart just past the crown. When shooting 300 SMKs I believe the jackets ruptured from too much spin, and that was the result.
The 325 gr Wildcat bullets which were bonded to an .035 jacket worked well however. These were hunting bullets though and are not intended for extreme long range.
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  #7  
Old 01-17-2008, 11:58 PM
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Fozzy

I would think a 1 in 9.5 or 1 in 10 twist would be fine.

If you intend to load hard (max) with the 338 Edge I
would go with the 1 in 10 but if you load below max
then the 1 in 9,5 would probably be the best choice
for the 300gr SMK.

250gr or 225gr bullets would need the 1 in 10 twist.

J E CUSTOM
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