Are they wax lubed? If you resized, and the lube grooves were still there but the wax cracked, the bullets would have to be relubed. If the bullets used a coating for lube they certainly would require relubing. If you are casting them I have a 9mm mould and sizer. I have a low cost source of cast bullets with cheap shipping. It would be an awful lot cheaper to buy 500 or trade for 9mm projectiles than purchase all the equipment to cast.