Sgt Preston back again. I dug out a few more non conforming rounds. On closer examination of the diameter at the primer end of the brass, just above the extraction groove, that diameter appears to NOT be concentric with the body of the shell. The net result is that the shell stops going into the case gage as edge of the rim gets to the gage. Part of the rim diameter falls inside the counterbore of the rim gage, while part of it is clearly sits on top of it. I'm using Dillon dies & a Dillon drop in gage. 485 out of 500 rounds fit the case gage correctly. To convince myself of what I had observed, I actually took a file to the OD of the rim of one of the non-conforming cases to "make it fit" the counterbore of the gage. I will not use that round but filing part of the OD did make it fit the gage. The sidewalls of my cases seem smooth & round. There are no apparent bulges or distortions. Hope this helps. Preston

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