Davedude, heat that Lee 00 mold on a hot plate, put a circular saw blade on the heating element it work better, I built a small “ oven lid” for mine out of a coffee can I cut down,set the plate on maximum setting! Let it heat for a while, like an hour, then set your pot to 750f and just cast with a quick cadence, till they fill all the cavities!
I’m using range scrap/ wheel weights 50/50 and having fair to good luck with that same mold! Stay with it, you’ll get it. I also try to get the stream directly in the sprue plate hole, if possible.
Good luck.
( when it works correctly, it is a thing of beauty) till it does, it can cause you to lose your grip on your sanity. Hahaha!!