I have been using an RCBS electronic scale for a year now and assumed it accurately measuring powder. I always checked the calibration using the included weights, and the weight of the powder pan was always the same to the .10 of a grain. But having read about other people not being able to have their scale remain consistent, I bought an RCBS 10-10 to check.
It turns out that the electronic scale shows charges to be .3gr above their actual weight. It's a shame there is no way for me to adjust the calibration, other than send it back to RCBS.