Measure the diameter of the various rounds at the case mouth, crimp or lack of may be causing the difference.
I suspect the headspace gages are sharper and maybe larger in diameter at the case mouth than the brass cartridges.
Try a few rounds of Wolf Steel case, they seem to have a larger and sharper case mouth.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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