How are you melting the lead ? a bottom pour pot is probably the best way to get consistant temp and helps pouring without voids in the lead . You should flux then skim your lead to remove impurities like oxides , a lump of beeswax works well , as for moisture in lead , a drop of sweat off your brow can blow up enough lead splatter to blind you , Wear a lead fume mask if you can find one .
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