FWIW the flattened primers aren't necessarily a pressure sign unless you'r seeing other indications? A sizing die adjusted not quite right and setting the shoulder back too far will cause primers to flatten. I had that experience once,and IIRC it didn't always do it on all the cases. A headspace gauge and/or a chronograph would tell you more.
Last edited by NorWestr; March 27, 2005 at 04:58 AM.