I've been conversing with the CZ Custom Shop and after a little work they have agreed to build the 527 in 6.5 Grendel. A group buy probably won't happen anytime soon as when I asked they said they wouldn't do a run of less than 1000. If you're interested contact jason@cz=usa.com. He seems to be interested in the Grendel and has been great to work with.
Cheers, Will
Cheers, Will