Samples were run twice. About 2 1/2 years ago I used some online lead alloy company. They came up with a Tantalum Gold alloy (95%/5% approx). When I recovered from the shocking news, I spoke to the Tech ane he claimed he ran the samples several extra times to confirm the finding. I was not fully satisfied with these results so about a year ago, I found a friend who deals in brass alloys, actually brass and copper powders. His tech ran the samples from a Super Magnum cartridge and came up with the results seen here.