Thread: Understanding Group and measures

Originally Posted by Woody

Have you measured case base to mid shoulder of a fired case and compared to your current "resized base to mid shoulder? The fired unresized case should be one that has had a near max charge though it to ensure it has fully expanded to fully fit grhe chamber. Another possibility is tha actual sizing die being out of spec.

Yes. The measurements are relative as I don't have the correct shoulder comparator (I using a 0.308 bullet one, it's supposed to be 0.330 for true mid shoulder) but it doesn't "like" brass measuring under 1.496, most factory stuff I have here is about 1.492-1.494, and my old die set up was bumping to 1.493-1.494