Anyone ever hear of using 308 go/no go gauges to headspace a 6.5 or 6 creedmoor? Was talking to a guy on another site and he has some savage rfiles in 6 creedmor for sale. I asked about who headspaced them and he said he used 308 gauges which seems way off to me. Did a few google searches and didn't come up with anything. Am I missing something?