If you can afford it a Harrell's precision powder thrower, is the best you can get, is unaffected, by drafts, battery's, vibration etc. and is easy to adjust and repeatable,
This is what Most bench rest shooters use, I've got three, 0-25gr, 10-60gr, 10-90gr
The All 3 (difference sizes) measure's will throw within a tenth of a grain, I have never seen variance with ball powder, longer drop tubes allow, for more powder compaction and thus higher charges. useful with BR, PPC cases.
Another big advantage is they are compact on the bench, I've sold of my charge master due to space required, and much slower than a high end powder thrower.
I use the Pistol powder measure lots(0-25) so quick to load a couple hundred, small cal, 22 hornet, 25-20, 32-20 etc.
I use the RCBS powder thrower for shot gun and have the layman 55, its accurate but does not have repeatable setting, and each time must readjusted by weight, once set you are good until you need another charge weight,
I have had mine a good few years,
if i had to down size to one i would keep the Premium BR model, this does to 60gr, about $300us now.
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