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I would not ignore the idea bullet metal may melt at a lower temp than pure lead. A quick search revealed lead/tin solder and lead/ antimony alloy melted under 500 deg f . Of course,that will vary with percentages.
When you get your thermometer check the lead melting in your pot for melt temp.of your alloy.
My knowledge of the topic is not strong, but couldn't the radiant infrared heat from the heating elements heat the objects...the bullets, hotter than the air temp?
Might your thermostat depend on air heat?
I'm not sure how that works
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