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Hunz - not sure if it would be exact or not, but brass surely cheaper than XC brass. And Ruger could do a variety of sporter and varmint/target models. I'd seriously consider one, perhaps over a 6.5 as the 260 does all I need that cal.
You make 6XC out of 22-250 brass the same as you make the 6.5 Creedmoor out of.I doubt that you will ever see a 6MM Creedmoor.There is no money to be made manufacturing it.Mr.Average Hunter is plenty happy with the 243 and ammo does not cost a arm and leg.