Brass & Primers DO NOT accurately report pressures, anyone tells you they do, slap them!
VERY carefully calibrated copper crushers do not accurately report pressures above around 45,000psi; without showing around 15,000 psi swings. So, your unknown alloy in an un-calibrated case, with un-calibrated primer cups WILL NOT magically be a more accurate reporter of pressures.
I have pressure traces from firing loads in a 308 with ZERO " pressure signs " that not only ran 70,000psi, that also had very nasty secondary ignitions.
Assume you have the same barrel length as book loads, they shot in SAAMI min spec equipment; production firearms aren't going to be that tight. So to match pressures, you will have higher pressures.
Now all of that stated, why are you reaming primer pockets?? That week could be a part of the problem.
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