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I'm getting ready to order a 308 win barrel to have put on a M70 action. What is the best rate of twist for 165-168 grain bullets?
 

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10-13 will work but I believe you will be stuck with 10 or 11 as choices, so 11 if you can find one.
I have a 13 twist Palma that is a 1/2 MOA shooter in a bolt gun.
 

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11.25-11.5 is the best comprimse consdiering whatg is out there. It will stabilize the long 155 the 168 even the 190s which are really to heavy for the 308 case for LR. Ideal for most is the 155s for punching paper and out to 600-700 the 168s Put [past that the 175OTMs and 155sOTMs are best for sure.
 
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