The mold is not hot enough. The first ones cast will show wrinkles, as the mold heats the rejects taper off. Once the mold is hot enough, pour and wait maybe 5-6-7 seconds and drop. By waiting to drop there is heat transfer from the molten lead/tin to the mold. Once you get the proper cadence down you should be able to cast 200 nice bullets before fatigue sets in. I only use iron moulds, they hold heat longer. Good luck!
