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Originally Posted by Clark
Maybe measuring C.U.P. is not a repeatable process.
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I think this is the best answer so far. It's not like they have a calibrated gauge on a test barrel that reads CUP. They measure the deformation of a copper pellet after the event. If the accuracy of the test was +/- 1000 CUP, I'd be surprised. They probably report an average for several firings and gain significant digits in the process...