Fritz454- Yes the brass is really nice. I can probably have dave Kiff re-grind the reamer to more closely match the brass dimensions . That would improve brass life considerably, however, a DGR needs generous chamber dimensions to assure functioning. I'm thinking it over.
Dean- YOU NEED A .600 OK. It's just that simple. If you go with a CZ550 action, I'll give you all the specs off of mine.-Rob