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Remember, all CUP does is "indicate" what the max pressure was.
Transducers tell you what the instantaneous pressure is and plots it over time. This gives you lots of information, and not just a crushed copper pellet.
This has also lead to the industry recognizing many powders that have pressure spikes too quick and sudden to show up in a crushed copper pellet but strong enough for them to be concerned. Thus, some powder have had their max charge weight reduced because they were having such random and large pressure variations near and at max charge.
I see it the old copper crush test was like filling up your car at the gas station, recording the milage, and driving until you run out of gas, re-filling the tank and calculating your MPG. I see the transducer as being like racing cars (see the Indy cars) that are fully instrumented and report everything that is happening at every moment as you drive. Totally different data sets and totally different data can be derived from it.
Finally, reloading manuals are only a guideline and if you think you know better, you can still free load whatever you want--just don't blame anyone else for the consequences.
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