I have been given a large supply of an unknown metal that the former owner thought was lead. After melting some of it down and casting a few bullets it was apparent that it was not pure lead. So i sent a sample to RotoMetals and for analysis and it came back as 94% tin, 3.7% copper, .25% antimony and 2% lead. Is this a form of pewter or some kind of babbit? It alloys with wheel weight metal and makes nice bullets. I have approx 400 pounds of this and would appreciate any info.