Not long ago, I read the following post on "Sniper Hide" asking the same question. One forum member advised the following; neck size 308 brass in 308 die. Trim to 1.910" (Creedmoor trim length). Remove the Creedmoore F/L size die expander. Size 308 case using plenty of lube. Replace expander and size again. You may have to turn the necks going from 308 to 6.5 diameter. Poster also said he tried sizing 243 up to 6.5 and lost many cases from shoulder collapse. The 308 route was the best. I'm passing this on hoping it will help you. I don't have a 6.5 Creedmoore.......yet but will save this information for future use.
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