I have seen up to 6% variation in Aussie powder but to clarify, this was before Hodgdon distributed them and also before burn rates were "tweaked" to align with the powders they were replacing.
It is like any other mass produced product, it will always improve as time progresses. Handling of the powder after purchase likely produces more variation lot to lot, even within the same can, especially when you ever have to screw the cap back on. Better to use the whole can and load a batch lot.
John
