With my favourite centre fire rifle; my M96 Swede Mauser:
Using the Lee measure with my reloads I can shoot about 1" @ 100yds.
Hand measuring each charge individually I can get down to about 5/8" @ 100yds.
I've never had issue running stick powder through it but it binds up really bad if I run H110 through it (a very fine flake powder.) I haven't tried larger flake powders as I tend to use scoops for shotgun reloading. I ignore the gradations on the adjuster as the density of the same powder from lot to lot can be different; thus why we reload by weight instead of volume anyway. As mentioned earlier I just adjust and weigh until I get it right.
It is really sensitive to consistent technique, more so than most other brands, so getting into a rhythm is really important. I put the arm up, tap the back of the stand twice with my hand in quick succession, put the arm down (dispensing the powder) and tap until nothing else drops out. I've tried not tapping and it was far less consistent.