Casting indoors is not a great idea, especially in a basement, unless you've set up some really good ventilation. Lead fumes are a capital way of giving yourself (and others) lead poisoning, and it will go through your whole home. Take that outside!
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While not quite on topic, when I was a kid in Detroit, my father had a bullet trap fabricated from 1/4" steel that we used indoors in the basement. I'm sure it was not legal but in the sixties it seemed no neighbors or cops cared. It was sturdy enough to handle .22 LR and .38 Special from a High Standard Sentinel that my grandfather owned.
The range was about 40'. We shot from a rest at the wet bar (!) through a doorway into the trap.
I remember occasionally getting hit with lead fragments while shooting my Remington 510 single shot rifle blown back from the trap through the 3'-0" doorway. We thought nothing of it back then. Many good times back then with no hearing protection.
I also worked at a trap and skeet shooting park near Omaha NE in '69-'70 with no ear protection.
Ah, the good old days.
Excuse me... what did you say?
Jim