6mm creedmoor gauges

OK, first off, realize that I am no more authority than you on this.
Now, my answer is I think the 6.5CM gauges will work for 6CM.
I tried my PTG GO/NO-GO gauges marked 6 Creedmoor in two rifles chambered in 6.5CM and the results were the same; bolt closed on "go" and not on "no-go".
I would call PTG, Clymer or JGS to verify. They would likely have some you could purchase.
 
Gauges are interchangeable on many cartridges. All the Creedmoor family cartridges use the "parent" case gauge, 22,6mm,25 & 6.5 CM all use the same gauge. .308 gauges work on, .243 Win, 260 Rem, 7mm-08 Rem. and .338 Federal. 30-06 gauges work on 25-06 Rem, 6.5-06 Rem, 270 Win, and 35 Whelen etc. Same for the Winchester Short Magnum family, Remington Short Action Ultra Magnum family and so on.
Headspace gauge interchangeability is common and gauges are commonly labeled with the "parent" cartridge, although some gauges may have multiple cartridges marked on the gauge.
 
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