Powder measures are great when you have a bunch to reload but take time to set up. For 20 - 40 rounds I find it faster to weigh charges. I have a set of Lee scoops and pick one that will give just under the desired weight with one or two quick scoops. Then partially fill the scoop and tap out enough powder to balance the scale. Becomes a very quick method with a little practice. My Redding 3BR powder measure throws very repeatable charge weights though I have nothing to compare it with.
