I think part of the point being missed here is, dumped/thrown powder isn't any different than what factory loads use. I don't suppose most of us would consider using factory loads for serious shooting or we wouldn't be hanging around a reloading website.
How do we know the powder scale is right? We check with calibration weights and we don't use electronic scales. I use a set of M2 calibration weights (and I don't handle them with my fingers!) for my scales, but obviously they are never going to have the accuracy of an analytical balance. Even so, I expect my Ohaus 505s to give me accurate weights to <.1 gr, when they have been zeroed properly. With rounding off, that degree of accuracy isn't possible with electronic scales normally encountered in reloading.
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