I don't have personal experience, but from what I understand they are a metric thread, the same as the old Mark X mini-mauser actions. I'm not sure you can find info on these either, but it might help in your search.
By the way, I just received the Charles Daly newsletter and they are no longer importing these into the US. Remington has bought the rights and will be selling these as one of their "international" models. And from the way the newsletter reads, Remington will probably not be offering them as actions or barreled actions either; complete guns only. Ain't that just the pits!!!