SNIP
Hey Stone,
Wow, expensive...but no need to "melt" round sinkers. Or use shot you buy at a gun store. Just pour it in.
Any chance you are in southern Ontario?? If so, there is a place that makes shot in various sizes near Ancaster.
As far as I've seen, you still have not identified EXACTLY what you want, but if you have room you could maybe use the wheel weights by dumping them "whole" in the same way, and no need to "melt" them.
Take care.
Brian Lawson, Bothwell, Ontario