I got motivated and fired up the gas pot and took the new Buffalo Arms stop ring mould for a spin. Sure casts nice. I slipped a bullet into a fired case and fed it to the Mauser. The bolt cammed it the last snick into the rifling as the last bit of the nose was slightly over bore diameter. The stop ring was unmarked so the chamber was the length of the case plus the ring. Kind of self breech seating. The loading notes for that rifle showed how long it has been since it has been out; all the loads were with 2400 so almost 40 years ago. We'll see how it likes 4227.