In case anyone new to powder measures is reading this, don't try to adjust the charge weight by weighing individual charges. You'll wind up chasing your tail. Throw for an average instead.
Suppose I want to throw 42 grains of powder. I'll throw five charges together and weigh that. When the total comes out at 210 (plus or minus a couple of tenths) for a couple of trials, I call it 42 grains and start filling cases.
