As others have mentioned the RCBS Standard full length sizing die with the Redding Competition Seating die is a hard combination to beat . I don't neck turn my brass , l also use the expander ball . Also use the Redding precision shell holder set of 5 , Headspace & run-out .001. Would I get better results with a Match sizing die , maybe but adding me into the mix may stop that one hole 5 shot group.
Hope I helped , The 6.5 CM Very Nice Choice.
Chris
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