Never ever put a big pot of lead to melt if pot had water in it. It may look dry but you are risking death. Steam explosion is more powerful than you can ever imagine
I had one drop of sweat fall off my forehead into the 12 quart cast iron pot I was using before pouring into the muffin pan.
You would have thought someone threw a firecracker in it!
One drop of sweat, one drop, I promise, it was very enlightening!