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as a general guideline its nice. however there are some things that are not taken into account. ive seen published load data reviews in guns of the old west, using the same powder measurer on one setting, that between powders you can have a 100fps difference in velocity, in the same gun, same day, same run of bullets.
on the other hand, ive seen where guys had a 20 guage single shot flintlock pistol, and when they used that exact powder charge and bullet in there 20 guage musket, they barely increased muzzle velocity by 40 percent even though barrel length increased by a factor of 3.
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