As Big Stick says, in one of my books the standard for a 7MM Remington Magnum is 52,000 CUP while the same load with the other scale would be 61,000 psi. The difference between the two systems of measurement varies from one cartridge to the next, and some cartridges like the 45-70 are the same for CUP or psi-28,000. So there would appear to be no apparent correlation between the two systems, that would allow a side by side comparison.
