New member here. I've been lurking and learning here for awhile, but this is my first post. With all the knowledge I've seen expressed here, I'm sure someone can a help a new fellow caster. I've been shooting and reloading for about 35 years, but recently decided to pursue the cast boolit. Problem is that I'm getting wrinkled boolits. I know that is usually an indicator of not enough tin or too cold a mold, but I don't think that is the problem. Here is my setup: Lee 10lb bottom pour furnace running at about "7"; Lee six cavity 310 grain round flat nose mold that I "beagled" to get the diameter up to about .434; alloy of about 4 parts pure lead to 1 part foundry type (which should put my alloy at about 3% tin, 4.5% antimony and 92.5% lead). The boolits are coming out wrinkled even as they get hot enough to "sizzle" when dropped in water. The wrinkles aren't what I would call excessive, but I've been remelting them because I just want better looking bullets. The kicker is that when the mold gets hot enough that the bullets come out lightly frosted, they are filling the cavities very well and producing beautifully formed "keepers". Any help or suggestions would be greatly appreciated.