I've never used N320, but it's about impossible (barring gross negligence on my part) for my Dillon powder measure NOT to throw a charge...
N320 is extruded, which might be problematic... I use flake or ball powders, which all meter better.
This... What are your MV, ES, and SD, and how heavy are your bullets?
It sounds like maybe you're simply at the ragged edge of loading too light...
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