Frosty bullets. I like my bullets to be frosty. It is at that point where I can slow down the process a bit and I am assured that I get all the mold filled out.
There are no disfigured bullets at that point. I have shot a jillion of them frosted. However, when you get to the frosting point, you have to allow more cool time for the mold or when you knock of the sprue cutter, you will start getting lead smears between the cutter and the top of the mold. Cleaning that mess up is a painful experience to me.
Harold Clark