DWalt
Member
STP works just as well as a case forming lubricant as it does for resizing. I don't form cases so much anymore, but I still do occasionally. For me, another essential item for resizing bottlenecked rifle cases is powdered graphite - I have a little device made for that purpose that has several different sized wire brushes and a trough for the powdered graphite. It applies graphite to the inside of the case neck. Makes lubrication of the neck during the upstroke over the expander ball very easy.