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skipperj... While primer inspection often does show some correlation with pressure there are many conditions which can cause flattening of primers which have little to do with peak pressure. On the other hand, some primers available today will show only modest flattening at 70,000 psi. In the absence of a device such as Oehler's M43 I'd suggest measuring brass by one of several techniques described in the literature- Hornady's Loading Manual and Waters Pet Loads contain two approaches. Any time you observe primer pocket "loosening" or marks on the case head which correspond to any feature of the bolt face it is time to back off considerably. Bob
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