[MakoPat]

If you want cheap and devastating try a 3/8inch (here in the States) sliicone ice-cube tray. The silicone holds up to the temperature of melted lead and the resuling 3/8inch cubes have a real bite to them.

Yep. That silicon is amazing stuff.

Winnie, have you ever screwed junk sockets to a 2x4 and poured lead into those?

Hexagonal rod shapes will shred stuff.