Gainsy,
Have a look at this site, I may have mentioned the principle last year:
http://www.bristol.ca/Warheads.html
Like a shotgun cartridge, spent shot. Also no lead poisioning. Unfortunately that still worries the Green lobby. See
http://www.miltoxproj.org/CM%20Fact%20Sheet.htm. With this site claiming that tungsten/nylon is carcinogenic:
http://www.cpeo.org/lists/military/2005/msg00165.html
Then our favourite arms manufacturer is in on the act:
http://uk.news.yahoo.com/17092006/32...munitions.html
I know, lets use Indian Clubs with a wrist safety strap.