Lee Mold galling
I use a small candle on the sprew plate screw. After so many casts, with bullets in eth mold--touch it lightly to the top of the sprew plate screw..it gives enough to last quite awhile and it will not contaminate the cavities.
I will try some syn oil next time with mine. Syn oil doesn't breakdown under high temperatures... With the candle wax, it will evaporate without leaving a residue, so you have to replenish it, after so many casting cycles. No big deal IMHO.