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Update - upon switching to an RCBS beam balance scale, I am getting variances of no more than 0.1gn from charge to charge either side of the mean. Since the scale can't read more finely than this anyway, I'm content to call the PPM dead-on within the limits of measurement accuracy available to me. It might take a bit of tweaking to get from one load to another, but once it's there it's trustworthy - if anything, the only significant mis-throws it makes are on the low side (when I'm too hasty about letting the micrometer reservoir fill). I have a couple of rounds ready to go that are loaded to maximum, but they got thrown short and trickled up - I don't care how good a thrower is; THOSE loads get weighed individually.
I love this thing. I'm kicking myself for not having bought one years ago.
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