Lead Shot Substitute for Loading Speaker Cabinets?


I have just about given up trying to find lead shot to fill my Von Schweikert VR 4 Jr speakers with. Two questions. Does anyone know where to purchase 100 pounds of lead shot? Are there acceptable substitutes for lead shot when filling up speaker cabineets? Sand maybe?

Thanks in advance.
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I am using Micro Bearings from Star Sound , which is like steel sand, VERY heavy and Attabits (sp?), small steel shot which is imported by May Audio. Both are not cheap, another thread on this suggested steel blasting shot, which I haven't tried. It should be cheaper.
Silica sand works well. While not as dense as lead, it is non-toxic and more than heavy enough. It can be gotten at any place that sells sand blasting shot. I use it in the stands of my speakers per the manufacturers recommendation. It is also pretty cheap at about $8 for a 50 pound bag.
There's another thread on substitutes

http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1243725688&openflup&1&4#1