Bill. Many of us have searched exhaustively for ppc brass. We prefer Lapua Russian brass for its metallurgy and flashole size, but my best efforts have been thwarted. Even when I found it in the US; they wouldn't ship to Canada.
Recently an interview of a Hall of Fame shooter; Jeff Pienhardt, revealed he forms his brass from 6.5 Grendel brass by Lapua. He makes his forming dies but I now do the same and have been successful with an appropriate bushing and a sizing die closely approximating my chambering reamer diemensions. After forming I machine my necks in a collet lathe, trim to the correct length and anneal the neck and shoulder again. I can do 100 brass relatively quickly and I no longer bother with the fireforming process. He shoots the first shot of virgin formed brass on the record target at major matches. I have found the finished case so close to my fired cases that I find the virgin brass as accurate. Careful forming of your cases will have very little or no bullet runout. The 6mm ARC, Grendel, and ppc share the same base diemension. I have used Starline 6 mm ARC brass with good results but don't know if 25 would hold up in a 2 day shoot or National event. Lapua will. After this interview it seems that all of Lapua Grendel brass has now been found and purchased I have found enough... but may be able to get 2 or 3 boxes of 100 Lapua 6.5 Grendel cases from a private vendor. I'm taking 2, and on spec and may buy the rest at the same price. I'm paying. $140/box.
It would be great to see you shooting Benchrest again. Many years ago we shot in Namaka at a Shoot I believe Al Murdoch named "Super Shoot". I'm just starting back at this as well. 2019 was my first shoot in Elmira, Ontario. Stan.