Is it possible without detriment to a steel or iron mold to just start pouring bullets? I know they will come out wrinkled at first but could I do this for a few bullets on my Lyman without warping the mold? I don't know the exact composition of the blocks so i'm not aware of the thermal stresses involved during heating. I tried this method with my Lee molds and the bullets have the same diameter range and roundness as when I preheated the molds, and no obvious problems that I could observe.
shoe