When working with 0-1 drill rod there was info posted regarding heat treating and stability / expantion rates. My question is if the material ( expands ) .0015" when heat treated per 1" of cross section , would a hole bored thru the center of a bar get smaller in diameter " whitch could either be seen as expantion or contraction". Or get larger following the outer dimention. I am wanting to make some sizing dies and am wanting to know how to adjust the way I need to cut and polish thes to allow for final lapping after hardening. Thanks in advance.