I don't know about RCBS or Lyman, but I know it's real with the first gen of the Auto Charge. I think it's real with all of them under the right conditions.
If you can't resolve your problem with your Auto Charge you may want to try the RCBS to see if it's any better instead of buying another Auto Charge.
Whether your Auto Charge is failing or something in the room is causing this, you should'nt have to put up with it.
Mine is really doing well but there are a couple powders out there that it really doesn't like.
AA9 is one of them.
What mine is superb for is really light load of fast powder like for a S&W 32 short or long. I used Bullseye and it never missed a load at 2 gr.
Really dense and heavy loads like AA9, the trickle speed is to fast for it. 2400 runs good through it though. Go figure. Has to be lighter and less dense or something.
If the manufacturers made their dispensers slow enough that they didn't have over charges of hard to meter powders, they would be so slow that no one would buy them.
For those of you that think your dispenser will dispense any powder out there without an over charge here and there, you haven't tried them all.
It's the nature of the beast. At least a Hornady Auto Charge can be programmed to go to trickle mode sooner, but it still trickles to fast to work well on the really dense, super fine powders like AA9.
Mine does ok with Corn Flakes like Blue Dot. I think AA9 must have done something to mine in a former life though. And that is disappointing.
For the majority of the powders I run through mine it works really well.