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Keep in mind that if one uses cartridge case visible and measureable indicators as a sign of pressure, the results across all cases available will be huge for a given set of bullet, powder, primer, assembly criteria and chamber, bore, firing pin & other rifle characteristics. There's a wide range of case metalurgy and I don't know of any standard that all the companies follow.
Therefore, if you want accurate pressure data in your rifle, it's got to be measured. Otherwise, guessing may or may not be just fine. You decide what safety limits you're willing to live with.
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