The uniflow with the pistol drum can be calibrated to 1/10 grain of many ball powders. I also use .380, if a powder measure can precisely measure that micro charge, it's perfect.
the little dandy has to be set with drums that couldn't possibly be that versatile, you would have to buy specific powders to get that standard sized drum to fit a charge capable of safely firing a .380. You could make it work with a large capacity case like 9mm, but the .380 is just too small. I looked it up once and it didn't seem to me that it was the right answer to that problem.
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