It's not the powder measure it's the scale.
I have that exact same scale and powder measure. Finally bought a balance type scale and discovered that the variations I was experiencing were due to the inconsistent Hornaday GS 1500 scale. It's a decent little scale but it does vary by several tenths of a grain or more each time it shuts off and you have to turn it back on. I still use mine to set the initial amount of the powder but do all my checking after that on the Lee balance scale.
Live well, be safe
Prof Young
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