+10!
For consistency on my powder measure, it gets three taps at the top of the arc for powder-in, three taps at the bottom for powder out.
Zero variation on weight…so long as the operator is consistent.
I see reloading students all the time prove it. They will tap-tap-tap the first few loads, then TAP-TAP, then TAP, then tap. Making sure they weigh each throw, I keep repeating "This is why consistency is so important."