I made a bunch of .25cal slugs with a swaging die, but the die was off and I received a replacement. Is it possible to resize the slugs I made and re-swage them?
If they are consistent with regard to weight, I would try swaging them to the correct size in the new die set. Depending on what was wrong with them, and the pressure applied, they should form to the new die.
If they are sized too large... you can resize them with the proper dies and punch... But if there is something else wrong... I would melt the down and make new raw cores....