I have one they chambered for me in 308 win. I don't know about their blanks. I ordered a 1-10 and when I punch the tight patch it seems more like 1-10.25 or so. So if you are looking to load heavy or long monos, something to think about. Load development took longer than most rifles.
As it is carbon, I can only get about three shots before it starts to walk. Let it cool and it settles down.
Have a Proof getting spun up now so then will have a Christensen, Carbon Six and Proof. The Christensen will put the cold bore and the follow up shot within the group. After about three shots it opens up a bit too, until it cools.