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Pyro Ball Mill Speed Calculation

Ball mill rpm posted in newbie questions ok so i know this is a question i should be able to figure out on my own i thought i know of some web sites that had the equation but i must have been wrong any way the jar is 7 inchs wide and 10inchs long and im using 50 cal round musket balls for media it will be half full of media so what rpm should i run it at thanks so much.