I find that with range scrap and all the dirt clay etc that I throw whatever wood scrap and sawdust in with old motor oil and let it burn , I have found that when melting hundreds of pounds of it that it works better that way , also I find that with the oil used the lead flows easier not as much tension to it , in my electric casting pots it is lubed bullets , wax , beeswax , and some cat litter on top , just my way of doing it and we all have our own unique or slightly different methods that work for ourselves .