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The table with the melting point and boiling point (vaporization) provides no useful information abut how much lead vapor is produced at regular casting temperatures.
The information that is needed is the lead vapor pressure as a function of temperature.
Even OSHA does not require soldering or lead work to be done under a fume hood, thay know that at regular melting temperatures the vapor pressure of lead is so low very little is vaporized.
Playing a torch over the lead to speed up melting WILL vaporize lead since the flame temperature can be around 1750 C (3182 F) and higher for certain gases.
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