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Old August 20, 2013, 10:40 AM   #24
reynolds357
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Join Date: December 10, 2012
Posts: 6,161
4 runnerman. Please explain to me how a Federal std and mag primer that both use the same cup can withstand differing amounts of pressure. I am not aware of any manufacturer that uses different cups in their current production primers.
A standard primer has to be manufactured to withstand the same pressures as a magnum primer. Know why? Many non-magnum cartridges generate the same pressure as magnums. Magnum does not reference pressure. Magnum is an arbitrary term that is used to denote a bigger, faster cartridge. You had the .270 Win. then WBY came up with a magnum version of it. You had the .38 colt, someone lengthened the case and came up with the .357 Magnum.
Magnum does not denote "high pressure." If you believe it does, you need to read a SAAMI specifications list.
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