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Are you implying that I can not trust what is listed as a pressure reading for cartridges in my load books? That they are outright lies and we can safely go further than max?
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You can generally trust that they are safe. But there is some disagreement about what "max" means. SAAMI keeps changing the standards, and there is a competing standard in Europe called "CIP" that has quite a bit higher maximum pressures.
There are some older manuals that used dubious testing methods that have very hot loads that may actually not be safe.