Only concept I have is with one set of headspace gauges you can do 308, 243, 260, 7-08, and the rest of the family with a standard shoulder. For the Creedmoor a set of headspace gauges only gets you into 6.5 or 6 Creedmoor after all the playing I've done and people I shoot with I haven't really seen one truly out perform the other, but there are some small differences.
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