Recommended small ball mill for BP?
WEBMar 15, 2021 · Somewhere around here I reported my results with various sizes of SS media from 3/161/2" diameter spheres, using a 4" diameter mill jar to mill the charcoal. The potassium nitrate grinds better with the larger 1/2" media. The sweet spot for charcoal in my rudimentary testing was 5/16" diameter.