Thanks TurnipEaterDown, (long for Ted?). That is an explanation that I can understand. I am looking for a reasonable place to get my alloy analyzed. In the meantime I will do a short run of .38 158s with the temp bumped up 25 degrees and add a second to the time the mold is left up. Those two things work together as when the temp goes up, the time for the sprue to cool each cycle gets longer or I'll get lead smeared across the top of the blocks. I'll wait to get an analysis on the alloy before I make any changes to it. Although I'll say I'm hoping that something like adding tin to the alloy will be the eventual solution as raising the temps slows the process, and cyclic speed is the whole point of the master caster. When I was younger I could outproduce the master caster using a Lee 6 cavity mold. But at 68 I can't keep up that pace for long. The master caster makes it so easy that I can pull that handle for 2 or three hours continuously.