I just dug my Frankford Arsenal Scale out warmed them both up and calibrated them with their own 50 gram check weights. I then weighed the check weighs on each scale (RCBS comes with 2) and all 3 weighed exactly the same at 771.6 grains. To my surprise the FA scale measured several different calibers of bullets the same repeatably to +/- 0.1 grain and matched the RCBS scale. Makes me wonder if I was doing something wrong before (like not calibrating it right, or not letting it warm or) or maybe it just needed some time to break in or something.