Would be interesting to see the weighing-vs.-throwing analyses
I haven't done exactly that, but I have run the stats on my Lee Perfect Powder Measure ($27) and my Hornady balance scale. For the balance scale, the smallest change or difference it has a 50% chance of detecting (Probable Error) is better than .04 grain. With ball powder, the measure is only slightly less capable.
If you run through the math at the link I posted earlier, in most cartridges a standard deviation in throw weight of .2 grains produces an effect so small that you would have to shoot many, many cartridges to even detect it.
There are things to work on that matter more.
