IMO, no but I'm sure someone will come along with a detailed study where they experimented with different levels of brass, pins and water. I use the FA mini with a stated capacity of 300 .223 cases and it will hold 2.5# of pins. I fill it up to the suggested water level, whether I have 300 cases in the tumbler or 250. I use the full 2.5# as well. I have found the best results are when I'm close to the 300 limit.
I use the FA wet/dry media separator to remove the pins, and it works very well IMO. I have not found a single pin in my brass after using media separator to rinse the brass well.
Ask board member Humpy. He originated the process twenty-odd years ago. His was in a Thumbler's Tumbler with 15 lb capacity using 5 lbs of pins and a gallon of water. That ratio would be 1.668:1 Pins to Water by weight to be fairly exact, plus soap and citric acid, leaving about a pound and change for the brass itself. But I don't know what the tolerances are.
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