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The old CUP standard was less accurate than the new psi standard, but it was not a "dubious method." Guns were designed and ammunition was loaded by factories for decades using that method, and it was not blowing-up guns. Pressure-tested load data based on CUP methods should not be confused with some of the early handloading manuals that did NOT pressure test their data by the copper-crusher method, but instead used MUCH less reliable methods such as loading up to sticky extraction and backing-off a small amount.
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"Dubious methods" is whatever they did to come up with the data in Speer #8. Perhaps they tested in cold weather only? Something's not right with that book.