I'm not really sure how that works Mark if there's only 2 to 3 thousanths head space. I guess the ejector is pushing the case into the front of the chamber so there's that miniscule movement backwards that causes witness marks.??
How does this work with a non ejector bolt then..
You set your head spacing up and the cartridge is free to move back and forth in the chamber with the bolt closed as there's no ejector to push the cartridge forward...???