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Huh? You'd better look into this one a bit. The long range black powder shooters are getting less fps variation than you get with smokeless powder, and have been for many years.
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Average, mean, or extreme spread?
But I think that you didn't understand the point I was making, we are talking a milspec load used by the US Military over the course of a few decades, using bullets made by multiple manfacturers, all used in rifles of various lengths. That is why there is a listed velocity range for the original loads, not because an individual lot wasn't high quality, but because there were so many lots and so many manufacturers of components.
Expect variation between suppliers, expect variation between lots. I wouldn't randomly swap FFFg loads between manufacturers just like I wouldn't swap load data between IMR4064 and AA4064.
Jimro