Don't do it. Waste of effort. Do a 6mm BRA instead, with a no-turn neck. Do it NOW, because you will anyway, after the Creed disappoints vs all the 6BR's you will shoot against. If you are only shooting 100 yards, go with a 30BR if score shooting, or a 6ppc if group shooting.I'm build a 6.5 creedmoor for bench shooting matches