While I am not sure about the accuracy of the RCBS Chargemaster when it comes to dumping exact charges, this is a little experiment I did with the RCBS digital scale.
I threw 10 charges and trickled them up to exactly 46.0 gr according to the RCBS scale. I then reweighed them on my Acculab VIC123 scale
1st batch 46.0, 46.06, 46.08, 46.02, 46.04, 46.06, 46.10, 46.08, 46.04, 46.06
So I waited a couple hours and ran the same test, thrown charges trickled up to 46.0 on the RCBS digital scale and reweighed on my Acculab
2nd batch 46.18, 46.08, 46.20, 46.10, 46.12, 46.14, 46.12, 46.08, 46.08, 46.12.
The target weight I am looking for is 46.0 but I will accept 46.02 gr because I am not cutting kernals of Varget. While the RCBS scale said all the charges were right on the money at 46.0 only 2 charges from the 20 where in my acceptable range.
If this was hunting ammo, I wouldn't have a problem seating a bullet and shooting it, it would be accurate enough. However I am loading this for long range competition and trying to make it as exact as possible.