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Message: <blockquote data-quote="nimrod" data-source="post: 4235490" data-attributes="member: 28249">I've cast lots of bullets with that Lee mold, but moved to a steel lyman mold. I agree with Ahall, check to see if something is keeping the mold from closing.  Or, like others have said, you may not be squeezing it shut.  I like to put just enough pressure on it to make sure its closed, don't have to try to smash it.Also, I bet running the pot on 9 is way too hot, that will cause the bullets to drop undersized as well.  I have a lead thermometer, but I sort of gave up on that.  I recommend try running your pot on about 6, see if the molten lead has the consistency of milk or heavy cream.  The lead should be liquid, and flow easily out of your ladle or spout, but be a little on the thick side.  That is usually right in that 725-775 temp range, hot enough to keep the lead liquid as it fills the mold, but not so hot that it contracts when cooled dropping undersize bullets.I am sure we all do this differently, but I want the puddle on the sprue plate to set up within 3-4 seconds of stopping the pour, any sooner, lead and/or mold is too cold, any longer, too hot.  The aluminum molds heat up quickly, but they also become overheated quickly as well.  I find that running a small fan nearby and holding the mold in front of it while while the pour sets up helps keep a consistent temp in the mold.</blockquote>