If in doubt, use the lowest listed powder charge. If I'm using Hodgdon powder, I'll use Hodgdon data. If I'm using Hornady bullets I'll use Hornady data.

As mentioned above, most testing facilities will have their own lot of components (brass, powder, bullets and primers) which may be different from an other lab's supplies, even though the "same" components are used. Some labs test with universal receivers and some with actual guns. Some lab's testing equipment (barrels, receivers, and/or guns) may be well worn and some may be brand new. If I saw two test data that were exactly the same, I would question the source of that data...