I’m casting pure lead (99.5% from RotoMetals) in a Lee 20-4 pot for Lee REAL 250gn 50cal ML bullets. I find quite a lot of very light dross floating on top after running the pot up to 750-775F when fluxing. What that accumulating? I don’t scoop it off until I’m done - should I scoop during bottom pours? Thanks for the advice!
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