atabites and/or other speaker fillers

All commercially available Lead shot is required by law to be plated with Bismuth. Don't eat any and wash your hands afterward, and there should be no problems. Even if it wasn't plated, elemental lead is poorly absorbed by the body. Lead poisoning usually results from ingestion of soluble Lead compounds such as Lead salts.

Mark,

While lead is indeed a dangerous material to ingest I believe that lead shot is perfectly safe. A gazillion hunters have been using lead shot and continue to do so without any harm to themselves whatsoever. There have been studies done on people that reload their own sheels in quantities you couldn't relate to. Lead poisoning is not an issue unless one wants to make it political. Remember, lead is only outlawed in waterfowl hunting. Most states still allow the use of lead shot for upland game birds and I believe nearly all trap and skeet shooters use lead shot exclusively. Your fears are somewhat over the top on this one.

Patrick

Lead shot on the other hand has an issue of a lead dust that is extreamly dangerous...

What about monitor speaker stands that can be made of low-carbon steel that is very vulnerable to magnetizm?

Lead shot is the way to go to fill up speaker stands. No worries about magnetic properties. Given the rate that magnetic force diminishes with distance, I doubt that there would a significant interaction between a speaker and it's stand. An exact calculation of the forces would be complex.