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I sometimes develop loads for a wildcat cartridge or cannot find data when a cartridge is new,etc.So,I have developed loads from scratch.I will use the burn charts to find a family of powders to test,but I sneak up easy,and study many loading manuals for cartridges with similar characteristics .
All of those charts have disclaimers to read and heed.
While a powder might give one level of performance at 46,000 psi,it might be a whole new ball game at 62000 psi.
Some powders are spooky because when you reach a certain pressure,a little bit more powder will give a big,sudden pressure spike.
As has been stated,you just can't substitute
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