Re: Varget + Harrells = @#$%&*!
Yup, throwing a zero weight charge is most likely something more than just the powder used.
I've done a whole bunch of experimenting, like using the knocker lever on the Ideal, not using it, and years ago even closing to the cut point on something (RCBS Uniflow???) and then opening back up to the fill position and then going back to cut the charge.
If it's an extruded powder, few things made much of a difference. Using the knocker on the Ideal threw heavier but less consistent charges last time. Sample sizes of at least 20 charges. Still fiddling and have been compiling all new notes into one big spreadsheet.
With the Dillon measure, the best results came from tapping 3-5 times with a 3/8 combo wrench on the measure body while the powder was in pickup position--but the =/- 0.2 grains was still spoiled by one that was +0.4 grains or so every 25-30 charges.
Spherical powders, mind-numbingly consistent, almost always +/- 0.1 for a total spread of 0.2, even with the Dillon measure. They have lots of advantages, but temperature/velocity stability is NOT one of them (shelf life stability can be much better with them, no "specimen defect" lots that I've ever heard of, regarding stabilizers and starting to break down early).