Somewhere on some forum, I think, I read an article on RCBS X dies. I either deleted or added it somewhere I can't find it. Do any of you know what I'm talking about? Have any of you used this die? Can you tell me when I should use it. If I buy the RCBS X set, should I use it right from the beginning, even with new, or once-fired brass? From what little I remember of the article it is excellent. Thank you for any help you can be.