I have a clear powder measurer that I set for the desired amount (100grns T7) and fill from the flask. However, in filling the measurer to the top I encounter some overflow/spilage. How can I avoid the overflow problem?

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When I fill my powder measurer I do it over a piece of Clean cardboard, what ever falls I can put back in the container. This works good in the house or at the range as long as you have a table where you can work. I use kwick loads in the woods so I don't need to do any measuring while I'm hunting. As time goes by you'll learn to do it better, and waste less.