I am having several difficulties casting these boolits for my .460 Smith and Wesson. After casting, I am getting measurements from .4515 to .453 on the same boolit. After sizing, I am getting measurements from .4515 to .4525 on the same boolit. This is my second set of molds from Lyman, I don't get it....Yes, I have cleaned the molds well with acetone before use. Do cast boolits shrink? I just cast 35 boolits, after gas checks, sizing and lube, I am getting weights from 325 grains to 335 grains. How much weight variation should I allow??? Any assistance is greatly appreciated.