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Patrick... You can't really go wrong insofar as safety is concerned by the study of primer flattening and flow, but the material used in primer cups varies greatly in both composition and hardness. Even within a given brand and type, there are normal lot to lot differences. This makes interpretation of your observations problematic. As an aside, the flattest primers I've ever seen were produced by a relatively current lot of RWS 6,5X68S factory ammo which produced a mean pressure of about 62,000 psi- this is relatively mild by the standards employed in some U.S. commercial loads.
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