I'm not real new to casting. I've got 4 different molds all Lee. My 452 300 rnfp gc keeps dropping bullets that almost look porous on one side. It looks like it would have dirt in one half of the mold. It's always in the lube groove and driving bands some boolits look perfect but it might just be one cavity with the problem. I leemented the mold with no change and I've cleaned it with brake clean and a toothbrush . No luck . Looking at the mold I don't see anything wrong