BK755,
It's exactly the same, no change in any dimensions or specifications. What Gene is refering to only applies to one cartridge; the 6mmBR. We recently had to reduce our neck thickness in these cases by a bit less than .0005" per side, or a bit under .001" total, to comply with CIP specs. We'd been running these cases on the high end of the specifications, and invariably, some ran just a tad over. This meant that loaded ammunition would sometimes fail to pass neck gaging as being slightly too thick. As a CIP member, we were legally obligated to reduce the thickness to a point where the loaded cases would all pass neck gaging. Again, let me stress that the 6mmBR cases were the only ones affected by this change, and none of the rest of the line was changed in any way.
The change to the new blue plastic boxes roughly coincided with this switch, but there is no such thing as "new blue box" or "old cardboard box" brass out there based soley on what they came in. It was coincidental that the 6mmBR brass was adjusted during this time frame, but there was no attempt to seperate them by box style. Your 6.5/284 or Gene's 223 Rem cases are completely unaffected by this, despite some misinformation or misunderstandings on the subject. I hope this helps clarify this a bit and puts your mind at ease, but if you have any other questions, please feel free to let me know. I'm always glad to help.
