The weigh readings appears to show increasing weight. That could be due to mold or metal temperature increases. Unless the mold, core pin, if any and sprue plate are FULLY up to casting temperature, the finished casting can vary in density and size. I dip the leading, bottom edge of my closed mold INTO the molten lead to help it reach proper temperature. I do the same thing with the sprue plate extension. If there is a core pin, as with hollow based designs, its temperature is critical to uniform and complete fill-out. An old trick is to dip it into the metal for a few seconds and hang it in the flame of a propane torch between castings.
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