You will usually not get pressure data from factory loaded shells. If you ask various companies, The answer you will get is just that their shells meet SAAMI standards. Which I think is 13,000 psi for 12g loads, if I remember correctly off the top of my head.
My guess is that many companies change up their loading recipe from time to time based on availability or cost of components and those changes mean pressure changes as well.
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B. Dudley
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