After more than ten years away from casting, I decided to get back into it after inheriting some good old Lyman molds. Using a bottom-pour Lee furnace, my results so far are mixed. Most of my bullets come out wrinkled, even after casting a few "throw-backs", and the edges are rounded instead of sharp. I cleaned the molds very carefully, and alternate two molds to avoid overheating them or cutting the sprues too soon. Even after the bullets begin to turn out slightly frosted, they are still wrinkled in some places, or not sharp on one side. I'm casting revolver bullets out of pure WW, and adding some tin solder to WWs for rifle bullets.
There are some specks of material in the slightly frosted bullets that might be tin oxidizing out in the mold (?). I flux the pot with Marvelux or paraffin. Have even tried sawdust, which seems to clean the pot pretty well.
It's kinda discouraging to cast a hundred bullets and end up with only ten worth spending powder on. Any suggestions from you experienced casters? Thanks!!