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Rate of Twist for 308win

 
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  #8  
Old 09-07-2008, 07:24 PM
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Re: Rate of Twist for 308win

In my Rem 700 .308 with a 1:12 twist, I can handle 165, 168, 178, and 180 g. bullet weights with sub-moa accuracy. I tried 150's the other day and they were grouping over 1 moa on me, so I know my barrel doesn't like the light-weights. I haven't tried 110 V-maxs, but that is just too light of a bullet for me to be using with that twist. Bench rest guy I know is using a 1:18 twist for a 30BR and he's getting around sub-moa. Each particular rifle is picky.
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  #9  
Old 09-07-2008, 07:38 PM
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Re: Rate of Twist for 308win

My shilen select match with a 12 twist works awesome with 150 and 155 noslers... better than half moa anyday. (I dont use heavier bullets because 150 gr. is more than enough for silhouettes.)

Joe from Old Mexico.
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  #10  
Old 09-11-2008, 05:13 PM
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Re: Rate of Twist for 308win

The 1-12 twist will work well with 150's up to the 190 SMK. A sweet spot for the 12 twist at 308 velocities is the 178 AMAX and 180 SMK. The original green hill formulas put the 12 twist at the 168. Modern twist calcs show a bigger bullet such as the 178-180. Shoot em all and settle on the best one for YOUR barrel.
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  #11  
Old 09-12-2008, 12:37 AM
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Re: Rate of Twist for 308win

For target shooting I got 175grain SMKs to pattern between .7-.3" depending on me.

For hunting I got 168 Barnes XXX to park at about .5"

The 180grain stuff I have yet to get to work out of my 1:12 Rem700P.

Haven't tried any of the smaller stuff as I've gotten these to work really well.
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  #12  
Old 09-12-2008, 08:20 AM
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Re: Rate of Twist for 308win

I shoot 150 grain Accubonds very accurately with a 1:14 twist. I have not tried the 165 grainers because I was nervous about their length.

the 150's are 1.230 and the 165's are 1.308 long.

edge.

Just read this thread on the 208 AMAX:

208 AMax in 1/12 twist 308Win, Range Report

Last edited by edge; 09-12-2008 at 08:39 AM. Reason: link added
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  #13  
Old 09-12-2008, 10:06 AM
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Re: Rate of Twist for 308win

Thanks for all the info everybody! Keep it comin'!
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  #14  
Old 09-17-2008, 11:03 AM
jmj jmj is offline
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Re: Rate of Twist for 308win

Years ago in competitive benchrest the "standard" twist rate for a 308 shooting the 168 grain matchking was 1 in 14. That was considered the ragged edge. Some had success using the 1 in 15 but most didn't. Those shooting the 180 grain were using the 1 in 12. I never heard of anyone having any accuracy problems using 180 grain matchkings from a 1 in 12 twist but that can also be considered to be the ragged edge of stability/accuracy. Just keep in mind that all barrels were stainless steel and stress relieved. Shilen barrels currently recommends a 1 in 12 twist rate for 170 grains or less.
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