I am using a Lee Precision Six Cavity Mold .401" Diameter 175 Grain Truncated Cone with a Lee 4 - 20 furnace. I am running my temperature from 750 - 800 degrees. I casting with wheel weight and averaging 180 - 185 gr weight after casting. Can anyone tell me why I am cast from 180 - 185 gr. bullets in stead of 175 gr?