On a bullseye pistol shooting forum a guy new to casting is having an issue with bullets coming out of the sizer undersized. He is using a Star sizer labeled .452 and bullets are coming out .450-.451. He is casting with a Lee 6 cavity hg68 clone mold and bullets are dropping at 208-210gr. He doesnt know the alloy but judging by weight it sounds soft. He cast the bullets and sized some the same day. I don't size the same day and wait at least a week usually months before i get around to sizing and have never had undersized bullets. The only thing I can think of is the sizing die isn't actually the size it says it is. I don't see how a bullet could come out smaller than the die. Any ideas on whats going on?
Scott