I am a fellow Texan, and home caster. I melted down a bucket full of WW today. I did it early this morning outside shortly after dawn. I have a well ventilated inside airconditioned area that I cast my bullets in when it gets hot here. I do my melt down of the WW outside cuz they smoke, and the smell that comes off them would leave the inside area smelling like the burnout box at the drag strip.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.