1 gallon ball mill making your own porcelain ball mill jars Studio Jul 19 2013 · I don t ball mill that much glaze anymore so a 4 is fine and holds about a gallon of liquid with the medium stainless medium depends on how long your ball mill is as for milling medium sizes I go with a ratio one quarter 3/4 SS half 1/2 SS and one quarter 1/4 it needs to be enough to go from end to end of the tube on