I just got the Auto Drum set up on my Classic Turret. It has been great. There was some minimal leakage at first but of course that was because I rushed and didn't clean it or brush some powdered graphite on the elastomer wiper and the rest of the inside.
Now it works like a charm. Very consistent and no problems so far. I have run H-110; W231; HS-6; Varget; W296; HS-700X; HS-800X. All ran we'll with no leakage.