I have a Lee 6 cavity 105 gr SWC mold. I now get a wrinkles on the bullets from a couple of the cavities.
The wrinkles are around the part line.
My lead temperature is 750F (PID controlled), I run my mold around 380-390F Start to frost at 390. About 400 the whole bullet is frosty.
The alloy is 92-6-2 "hard ball". I use two stroke oil very sparingly for the lubrication.
This mold has dropped good bullets before. I have stripped the mold and cleaned with both brake and carby cleaner. Even tried it when it is hot.
I have check the mold parting faces to make sure there is no blockages in the vent lines. I run moderate flow rate from a Lee 4-20 bottom port pot.
Any suggestions for cleaning the cavities or what else could be causing the wrinkles?
Thanks