I just got a Lee Precision 457-340-F Double Cavity Mold that is a bear to get the bullet cavities to fill out. I run my pot at 750 degrees and don't have a problem with casting with a Lyman 45-70 292 grain style mold. I noticed that the spruce plate holes are larger on the Lyman mold and was thinking of opening up the smaller holes that are on this Lee mold. Anyone else run into this kind of problem?