I recently emailed CZ-USA enquiring about the twist rates of CZ 527 Varmint barrels in 223 & 308, this is their reply:
"The 308 and the .223 are 1:12 except for H-S Precision stock .223 which is 1:9 Thanks"
I think this is an important difference given what the guns will probably be purchased for & one that is not even mentioned in the press release.