Guys I'm having a problem sizing my bullets before powder coating. At first they went through the RCBS sizer well, probably had some old lube residue in the die. After about 30-40 bullets they start going VERY hard, taking lots of force to remove from the die. If I were to try to add some kind of lube, I am afraid my PC would not stick. What do you guys use? What have I missed here? Thanks!!