I had an interesting experience trying a new powder, Unique, with the adjustable charge bar. The bar worked fine with Bullseye, as it is such a small, fine powder, but the large flakes of Unique would not fall into the angled slot on the bar and measure well at all. The bar works much better with finer granule powders, I really like the flexability. You dont have to take things apart to change charges.
I was back to the disks for the right sized load, which fell straight down then, and measured fine. I weighed several, and they are very even from the disk.
A good light, close by, will help you see your load before you place every bullet. You can see how much is there. One thing to remember it to pull the handle all the way, for the indexer to work. I seem to have to watch that when I am weighing, because then I dont. I seem to think watching that bullet sit over the right load is one of the most important parts of the process. I guess its easier to see the powder for pistol cases than rifle.