One- Don't trust any one scale, if you're lucky you'll only wind up
wasting a few hours with a bullet puller. Otherwise, it's a blown up
gun and possible eye and hand injury.
Two-When you put cartridges in the shaker for cleaning, be sure you
only clean cartridges which won't nest inside each other, otherwise(as with
say .45 and 9mm together) you wind up with a dozen or so bullets
jammed tight with media.