I finally bought some large primers. I read about the Lee auto drum powder measuring device and I liked that it could adjust to unlimited desired powder grain adjustments. So I got it set up and dialed in at 4 gr. This device has a safety piece to stop double powder charges. It is a very cheesey plastic set up but I figured if it works then I would be fine with it. Well I wasn't fine with it. It sucked bad. One drop would be 4 gr where I set it and the next drop might be .04 gr or 1 gr or 2.6 gr. If the safety isn't pushed down it will not drop powder so I thought maybe I hadn't released the safety. So I checked and my releasing the safety wasn't the cause of these pitiful powder drop differences. I had to check every round after charging to see how many grains it dropped. I watched the movement of the drum and it didn't move the full travel down to the charge tube every time. I would have loved to call Lee and bee eye zitch but it was around 2 a.m. So today I disconnect the cheesey safety device and how about that the powder drops were mostly on 4 gr with an occasional .3 difference. My safety measures take care of powder mistakes and poor primer seating. I size the casing and install the primer then I set the casing on the scale to be sure casing is sitting flat. Then I put casing back in press and powder charge it. I dump the powder from the casing onto the scale to make sure powder drop is within specs. If it is then I put the powder back into the casing. I turn the plate to the die plate to last position and reinstall the casing into the press. I then again put the round back on the scale to see that it is within gross weight of correct loaded round. I know that is a lot of steps but it is a great safety check system that works for me. Time I have and a little more time involved is better than a squib or a big bang destroying a gun or damage to myself. Anyway I like this Lee drum charger since removing the p poor safety.A turn of the key can change the grain charge drop by tenths of a grain. The disc charger is very limited.