elster,
in fairly extensive testing against a lab grade scale, i've found that the chargemaster will drop loads a that are consistent to right about +/- .11 grain without reading an over or under charge. That means you could have a spread from one round to the next of somewhere around .22 grains and you won't even know it, because the chargemaster doesn't even know it. That's just the way it is with this scale. It's a nice tool and will definitely speed up loading, but you can not expect top accuracy and repeatability from it, because it simply isn't capable of it, regardless of what mods you do to it. If a .22 grain extreme spread is acceptable for your purposes, you will love the chargemaster. I have been using one for over 10 years and have loaded untold thousands of rounds with good success, and for most uses it works just fine. That said, i will not use it for loads for important matches, or for anything past 600 yards as the inconsistencies start to show up in the real world.