Because every single rifle and chamber is different...
The idea (which Dino seems to have a firm grip on) is that you test pressure in YOUR rifle, to see where IT starts showing signs of pressure. The reloading manuals are based on a theoretical SAAMI specification, you could have a rifle that shows pressure signs well before the theoretical max load, or you could have a rifle that allows you to load well above the published max load...
Good comment about the safety glasses, also good to wear them when handling primers etc![]()
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