Do not use aluminum pots for melting lead! I have heard (and seen one) horror stories about aluminum pans failing when melting lead. Aluminum does not "glow, turn colors" when approaching their melting/failure point, so everything looks fine then suddenly the bottom drops out of the pot and melted lead goes everywhere (hot!). Dangerous not to mention the huge mess!
https://castboolits.gunloads.com/showthread.php?413484-Aluminum-pot-for-melting-lead
https://castboolits.gunloads.com/showthread.php?413484-Aluminum-pot-for-melting-lead