With all the talk of differences in lead purity , I thought I would see what you Guys make of this.... Over the past 40 years I’ve cast many fishing jigs, sinkers and a few round ball’s along the way. I don’t own a lead tester, thermometer, until now I’ve never really had any issues being able to produce a few hundred shootable round ball’s in the past. Before now, once the mold got to temperature , the wrinkles disappeared and all was good.... Then this happened..... Thoughts? FYI- The lead being used is soft, it can be scratched with your thumbnail.