This has been alluded to, but pressure is not one-dimensional. It has both force and time dimensions.
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<br>Similarly, bolt thrust has a time and force dimension. A cartridge fired with a very fast burning powder at a peak pressure of 60,000 psi will result in an entirely different amount of stress than one fired with h1000, at 60,000 PSI. The area under the curve (above the 40,000 PSI yield strength of brass) is simply larger.
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<br>Further, I would not be surprised if there is a "time delay" introduced by the cartridge case head. It takes time for the brass to yield, move, stop and push. How much? Only a well designed experiment, with strain gauges located in at least two places will show if it is measurable, and significant. FWIW, Dutch.
