Adding weight to Duncan ceramic pieces


I have a similar ceramic set that I've considered weighting as well, but haven't done it. I've seen some people recommend tungsten putty, but it's very expensive - about $5/oz. I've seen other people recommend simply filling the piece with shot and then adding epoxy. That seems a bit dicey to me as some of the shot may be loose and you will end up with something that rattles.
Whatever you try, I recommend buying a few cheap test pieces that you don't mind destroying. If the putty/epoxy expands, you might end up cracking the ceramic.