Couple of thoughts about the powder measure. My Hornady measure seemed to drift upwards for the first 20-30 rounds in a tray. Drove me nuts. Then I figured out that tho prowling charges itself was making the powder in the measure compress a little. A baffle helped. Filling the reservoir 1/3, tapping the measure for a minute with a screw driver, fill to 2/3 and tap some more, full and do it again. The first charge already in the rotor will be VERY compressed, but this approach eliminated the upward drift I was experiencing. Now I just have a little vibrating motor rubber banded onto the measure and run it for a minute or two before getting started.
I also learned that running a lot of powdered graphite through the measure smooths everything up nicely. (thanks Nick!)