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static is likely the culprit ...and I use anti static dryer sheets ....and wipe the powder measure down inside and out until no particles of powder stick to the wall of the powder cannister .....and I put some dryer sheets into my powder storage cannister.
No more than 0.1 grain is acceptable on handgun loads.../ although you might have a little more leeway depeding on the powder you're using .../ but not much. Any decent powder measure ought to get you down to the 0.1 grain without a big problem.
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