A picture would help but it sounds as if you have a set of Gauges that E.R. Shaw sends out with their barrel kits. These gauges use a datum point that is calculated for a certain diameter and do not use the cartridge angle to locate the headspace. I hope that I conveyed my thoughts clearly.
[img width=1020 height=768]http://i1202.photobucket.com/albums/bb363/stangfish/Gauges-Copy.jpg[/img]
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