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Lead fumes are not a problem -- nonexistent -- until you get above 1200 degrees. I normally cast at about 700 degrees. There is not enough vapor pressure to create any lead in the air at that temperature. So I do not wear a mask when casting bullets.

However, when I smelt wheelweights or other scrap, they are very dirty and a lot of crap burns off. I definitely do that outdoors and I do wear a respirator.

I am far more concerned about making sure I wash my hands, do not touch my mouth or eyes, and avoid dust from tumbling brass. Those all create more of a risk of lead poisoning than lead vapor fumes.

Andy, looking at the above, you may want to consider a casting thermometer in your future -- especially if you ever decide to process wheel weights. From the colors, it looks like you got things pretty hot.