I have a Lee 4 stage Turret Press and that came with the Lee Pro Auto Disk which leaks fine ball powders. The Auto Disk is garbage. I then looked at the Lee Auto Drum Powder Measure, but I got the impression it had similar issues so I kept looking and settled on the Lyman Brass Smith Powder Measure. It's easy to set up and it doesn't leak fine ball powders which I primarily use for pistol loads. I can dial in my charge in about 5 minutes and it works perfectly. No leaks whatsoever.
For extruded powders like H4895 or H4350 they get caught in the up or down stroke when charging a case because the kernels are too big. I still hand measure my large rifle loads, but at some point I'll move to an electronic digital powder scale and measure. Just need some more space on my bench.
Lyman Brass Smith Powder Measure
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I have the RCBS version of that already. I’ll admit I haven’t even tried it.. I just knew that I didn’t want that second action when charging a case, I just wanted to upstroke and be charged. Didn’t want to crank a handle.
I will get a mount for it though and probably use it for some 30/30 or something. But my precision rifle loads I have a electronic dropper I use for them.