243winxb: The note on that pressure ring is very interesting. In the 300BLK, the ridge I'm talking about (which sounds just like the ring you are mentioning) actually ends up below (seated deeper than) the neck of the case. I know that many Berger bullets are also long for caliber, is this the same with your 243/6mm application?
As I said above, Remington may very well be over-annealing their brass ... and it may not work with any bullets that have a pressure ring at the base.
Saands
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