I have a Chargemaster, and like those above - love it. For me, it is for low volume rifle and pistol work. For high volume pistol work, it is the Dillon 650. Neither answer your question.
After starting with a whack-a-mole, I upgraded to a RCBS single stage. With the increased speed of a single stage (yes, I really typed that
), I needed to charge faster. A buddy who was getting into reloading got a RCBS little dandy, a volumetric throw. We used that throw by hand over each case in a block. After throwing, it allowed an easy visual check before seating.
The key with a volumetric throw....doing it the same way every time. The same rotation, no bumping, no tapping, nothing different. The consistency is hard, you have to concentrate. Some powders meter better, but technique is important. The easy way is practice, throw 10 (or what ever your magic number), and weight them. What you are doing is a poor man’s gage r&r. Really fun if you do the statistics to go with it