I don't think I have any that will change significantly if I keep the powder level in the tube pretty constant when running ball powders or something like Benchmark, long grain powders like 3031 or Flake like 800X I weigh every charge and just dribble for unders and dump out overs.
I don't think even if I had the best powder measure I would still check every ten, you never know if there is a piece of bottle plastic in the powder or a clump and it is alot easier to take down 10 rather than a hundred.
I have Lyman 55's, Hornady, Redding, Midway(pistol), Saeco, and an old black RCBS two drum, all but the old RCBS are Micro adjustable, the RCBS is adjustable through a hole in the back and I leave it set up for 10gr of 800x, supisingly it is the most accurate with that powder.
Every body says Harell's is the best but I could never see the need to spend that kind of money, most of my measures are yard sale or sale table at the LGS purchases.
Sounds like you want to speed things up. If money isn't big deal invest in a Progressive loader and cross your fingers that nothing goes wrong.