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OK same as me. I only ever did it the once, when I was setting up for my new 284W. I think I did 5 and found a wee bit of variability which I took the average of the 5.
With my ancient eyesight I...

Easy to do, well potentially messy, on your own reloading scale. Although longer cases don't sit in the pan well - the potentailly messy bit!

Just fill case with water and weigh.
The issue is...