707, How are you measuring your brass? I find that the only measurement that I can make with any confidence is "relative" case length. That is, one case vs. another. I'm using the stoney point comparator for a digital caliper and an appropriate adapter that indexes consistently on a straight portion of shoulder. I find it difficult to draw any conclusions regarding whether the chamber is long or the cartridge is short with respect to any established spec, particularly given their choice to specify length at readiused shoulder transitions and the like. Even though three brands of unfired factory brass all measure within .005", that doesn't mean they are "standard". I suspect that in my case both the brass and the riflemaker both take advantage of a cartridge that headspaces on the belt and err on the side of a "loose" fit for compatibility vs. precision (and case longevity for handloaders).
