Hodgdon claims their Extreme line of powders has smaller lot to lot and temperature variations than other brands. We've got some ideas on the back burner to test their claims regarding temperature variation, but we're starting to get much more practical about quantifying the lot to lot variations in velocity for some of their Extreme powders. The basic idea would be to pick a powder and cartridge, say H4831 in the 25-06. Keep everything else constant (powder charge, lot of brass, lot of bullets, lot of primers, etc.) and shoot 10 shots each with a carefully measured powder charge from a given lot. Repeat for several lots and then compare the average velocities between the lots. (We think we might need to interleave the shots from different lots to eliminate the possibility of changing environmental factors, changing friction with barrel fouling, etc. from confounding the results.) Repeat with different powders and cartridges, H1000 in 6.5x.284; H4350 in 30-06, Varget in .223 etc. What do you think? Is this a convincing experimental design to detect lot to lot powder variations? What might you suggest we do differently?