Unless your dies are defective (poor quality steel, or carbide), antimony/tin alloy cores won't harm your dies. I use wire of, up to 3% antimony and 1% tin, using both Niemi and Ulrich dies - I do this regularly. So, I agree with George (see his posts). Also, using 3/4 to 1% antimony will greatly reduce 'cored' jackets sticking on the core-seat punch, and make very uniform finished dimensions. In my opinion, for precision bullet making, "pure" (corroding grade) lead wire is the poorest choice, 1/2% is better, and, up to 1% is better still. RG
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