I've mentioned this before, but we have new people now. I too have a Belding & Mull, the one and only powder measure I've ever owned. Notice, I said owned, not used. I think it's one of the best on the market. Mine even cuts coarse rifle stick powder. The one thing I had go wrong with it is the aluminum slider block got gauled up. So I cut a bronze block and milled out the cavity and cut a piece of glass for the front of it and installed it and my measure is like new again. I hand fit that bronze block too so there wasn't any loseness.
I have the micrometer metering tube. Once you weigh a particular powder you can write down the setting on the metering tube. I do this and record it in a book for future use.
Joe