Common pistol primers will begin to flatten at about twenty~30k psi, depending on brand name and magnum vs . regular. Looking at a 9mm can run as significant as 35k psi for usual hundreds and up to 38,five hundred psi for 9mm +P, there is no doubt . I keep in mind that way too. My forty yr old da

Then again, if a few of the primers that gave poorer ends in your tests with a certain .308 load gave significantly better success with a special cartridge/powder/bullet fat, it would be Significantly more difficult for making any typical predictions that might enable a reloader to help keep a stock

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