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The school of thought on the twist rate in relation to accuracy is the faster shorter twist rates tend to stabilize heavier bullets in their spectrum of bullet weights d available and the longer slower twists such as in the case with your .308 lighter bullets tend to stabilize easier . Do bear in mind bullets of match quality can tend to move outside of these parameters as they tend to run very long and will have a higher coefficient . It is not uncommon for say a .223 with a 1 in 8 twist that should like 60 gr. and heavier bullets will shoot a 52 gr. match bullet like darts. The twist rate on your .308 says it should lean more to 150 gr. or lower but dont rule out premium bullets 165 gr. or higher with high coefficient ratings. All of this said it still takes the right combonation of powder, primers, good brass and good repetative reloading techniques to make it all happen. It can at times seem elusive and just when you seem ready to give up you will find the majic bean that makes it possible to get the golden egg .
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