Tanner, funny as Hornady execs told me they were doing a 270/TC back before the 6.5CM rolled out, was to push a 120 at the WCF/130 speeds. Seems like they could have capitalized on the 270 name, short action craze, and non-mag recoil, and avoided the 'what is a 6.5' by many not in the know.
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.
The 243 fits in a short action with Amaxs and VLDs, so they aren't gaining anything there. That was really was the big selling point of the 6.5 Creedmoor vs. 260.
Probably less than 1 grain difference in case capacity between the 6 Creedmoor and 243. A little more neck length, but that mostly just matters in cyberspace.
What would it do that a 243 Win would not?
