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Charles, slightly off topic from the polishing subject but you mentioned that you have been using One Shot for straight wall cases. This is what I do with pistol cases to make it easier to load and you do not have to lube.
Get a pair of cotten gloves and just put a few drops of oil in the palm and fingers of each glove. Not much oil, just one drop on each finger and 3 or 4 in the palm. You just want the gloves to have a "light touch of oil". I use FP-10 or Breakfree, but any gun oil will work. Let the gloves set a day or so to distribute the oil. After you remove the media dump the brass in a box and just run your hands with both gloves on thru the brass as if your were hand tossing a salad. Do this for 30 seconds or so and the brass will no longer be dusty from the media and it will cycle thru the machine easier. You really cannot tell the brass has any oil on it but my 650 can sure tell the difference.

I keep the gloves in a box near my tumbler and I cannot remember the last time I had to "re-oil" them.