I have always used electric. If you prefer ladle casting, you can find some really nice pots that will allow that.
I imagine it is easier to control the temp with an electric heat source, rather than gas.
Using a gas (turkey fryer) source to melt/smelt down large quantities of lead is probably the best choice, but for casting, I'd go electric.
edit: Look at the Lee brand 20# capacity... best value.
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