Again, my observation has been that the temp is right when I can take the ladle and mold and stick it into the molten lead and it doesn't freeze over the pot and that after a few minutes in the molten lead the mold will come out clean with no lead stuck to it. Then as described if the bullets are dropping wrinkled I speed up the pour rate it increase the mold temp. Fill and dump quickly. Once I see them starting to get frosty I slow the pace between the drop and the fill and the mold will cool. So far that is working for me with COWW's as the alloy.