Pressure Signs: What, Where and Why?

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One of my rifles, a 9.3x62 has flattened primers from every firing. The cases are Sellier & Bellott, and the primers were hard to seat right from the beginning. However the bolt lift is fine and the measurement at the web is fine too. I found out later that S&B brass seems to flatten primers pretty easily. SO yes, flattened primers are not an adequate indicator of excess pressure.