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My guess is that the CUP system existed long before the existance of the modern strain guages that can measure psi accurately.
All other load books that have published loads for the 45-70 have published pressure numbers using the same scale for the last 100+?? years.
It was probably deemed not safe to publish the psi numbers for the 45-70 because people might confuse them.

The 450 being only a few years old had no history to confuse pressure scales with.
 

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Lyman's 49th is a great book! I have really enjoyed it.
 
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