I agree with Smokey Joe...
I've used a Lyman #55 powder thrower for over 40 years and it's still doing just fine. As Joe sez, the Lyman #55 remains very consistent as it throws very small powder charges.
To maintain its consistency from "throw" to "throw", I use the "Tap Method"... that is, I lightly "tap" the operating handle against it's final stop a consistent number of times... usually 2 to 6 times, depending on whether or not I'm increasing the powder charge for just a few rounds or for many rounds. If I'm doing it for many rounds, then I adjust the micrometered slides.
I've found that each "tap" is worth about 1/10th of a grain of powder as each additional "tap" compacts the powder in the powder cavity. And so, if my Lyman #55 powder thrower is set pretty close to the exact weight I want to throw, it usually takes 2 or 3 light "taps" of the powder thrower's handle to maintain the consistency of the powder drop.
It's kinda hard to explain, but easy to do... and tapping the handle a few times is easy and makes for very consistent powder drops.
Strength & Honor...
Ron T.