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After strictly full length sizing for my 204, I have decided to try bump sizing to see if I can squeeze out a little more accuracy.  The issue I am having is that I am not getting shoulder movement at all, even when the die is fully seated.  Actually, the case seems to be expanding by a few thousands.  I am using standard RCBS dies, and measuring with the hornady headspace gauge.  I am trying to adjust the sizing die to only move the shoulder back .002".  Has anyone else had this issue?  I am beginning to think the die is just a bit long.   Should I try a different die manufacturer?  I think I remember reading online about some people having this same issue with RCBS full length sizing dies...