I recently bought a set of electronic scales which I would think is a more accurate method of weighing powder than balance scales. I was reloading Hornady 129 SST for my 6.5. Out of curiousity I took a sample of 10 heads and weighed each. The lightest was 129.2 and the heaviest 129.5. I then tried a sample of 10 Midway Dogtown 55gr .22 heads that I reload for my .22-250. Each weighed exactly 55gr.
In terms of shooting deer the slight varience in the weight of the SST's makes no difference but in terms of measuring distance to lands in thous and weighing powder to within .005gr what difference does this make to precise accuracy.