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I have a foot long bar of Bismuth, but lead is heavier. Just saying.
Where's the 4 pound Mikado when you need it?
Bob, The point is you only have X amount of space and after filling that space you want it as heavy as possible. Bismuth is easy and works well and I even have it in the sand done of my first Mikado, but I built it like 20 years ago. Now I would make it heavier. And I believe Max found some lead that is more pure.
I was successful making several castings using your favorite epoxy, JB Weld mixed with craft sand. But I had to make a ex pattern first. Seriously. The clay will work really well.Really though all you need is an old spoon or stainless measuring cup and a pair of vise grips. I like to let the surface flash before I pour.