I used a .5cc cuz it was on the bench. Here's what I got.
.5cc Scoop scraped level with a card:
3.8
4.0
3.9
3.9
3.7
Lee Perfect powder measure dropped with no extra action taken:
3.6
3.3
3.9
3.4
3.8
I rapped the body of the PPM after the last drop and it dropped .2gr of powder sitting in there
Lee PPM with 4 raps on the body in each direction of the handle. 4 raps to fill the drop, 4 raps dropping into case:
Same setting as the "no rap" drops
4.6
4.6
4.6
4.6
5.0