yeah the digital powder sensor for the Mk7 was only designed for doubles or no charge, it was never for detecting small variations. Even the laser, while more accurate and easier to set, can't really be trusted for anything better than half a grain maybe even a full grain depending on powder and speed you're running at. If you're running mixed headstamp brass just the thickness of the web will drive you crazy from case to case. I've been thinking of measuring from the bottom of the case to the mouth on a wide variety of cases and find some that sit in the middle and then use that as my base case whenever I need to rezero. As it is now I could be using a case with a thinner web, or one with a thicker web, as my zero and then having to adjust frequently until I find a middle ground.
@MikeyScuba damn dude that sucks, what broke in the die? Spring loaded hold down?