doghawg -- You indeed started quite the (enjoyable, educational, fun) thread! And, it is germane as bullets are cast of wax, too! Thank you!
What I'm adding is I have read
MANY warnings re shooting wax bullets
indoors. Claims are the fumes from primers are super-high in toxic lead in air. Also, from detonating primers in, say, a basement, lead will end up on walls, floor, ceiling -- all surfaces -- which, too, is a hazard from their lead styphnate base. (To children, pets, future buyers of your house...._
I've been intrigued with getting lead-free primers, which I've read about, but have yet to find a source, for my wax bullet shooting. A great "read" on lead-free primers is
https://arxiv.org/ftp/arxiv/papers/1410/1410.6390.pdf , and they even have a table listing pressures generated in our lead styphnate based ones (to choose the ones with highest pressures?).
I have gotten quite a bit of enjoyment with my fairly recent entry into shooting wax; again, thanks for the thread -- when I read your desire to shoot in your basement, it prompted this reply. Good luck!
geo