XBBR Shooter
New member
PS. My .220 brass was not Blue box. But, I think just before.
I read on one of the threads that the change to the blue box, and the change to the 0.015 neck did not happen exactly at the same time, so it is possible to have thick necks in a cardboard box, and thin necks in a blue box... or so I understand it.
But that is second hand info, so consider it for what it is.