To measure pressure I designed instrument amplifiers, epoxy strain gauges to the chamber, connect the strain gauge to a Wheatstone bridge circuit, and connect that circuit to a digital storage oscilloscope, and interpret the signal with Roark's formulas for stress vs strain in open ended tubes... or...
When Quickload velocity predictions match the chrono data the batch of powder can be characterized. What is in the QL library may match my jug perfectly or be off by 4%. And we are paying for "canister powder"
The QL pressure prediction threshold to make a primer pocket get loose in 243, 257 Roberts Ackley, 25-06, 260 Rem, 6.5-06, 270 Win, 308, 30-06, and 8x57mm is the same, despite the wide range of SAAMI registered pressures.
I have done that.
I would assume that other large Boxer primer pocket Mauser case heads would have the same threshold without me testing them; 22-250, 6mm Rem, 250 Sav, 6.5x55, 300 Savage, 7mm-08, 7.65x53mm, etc.
Why do I do this?
Because I am curious and because I can.