I would presume, from the introduction to the database, that they are limiting their analysis to commonly available reloading powders. The database is primarily used to analyze residue from IED's, not from residue from gunshot wounds. Again, the powders used by the factories may, or may not be commonly available. Lot to lot variations in bulk powder preclude use by handloaders seeking consistent results from various lots. Sometimes you will see bulk powders available for sale as "surplus" from pulldown ammunition, and they will tell you to cross-reference with a certain powder, but start loads must be "x" percent lower.
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