I have some mystery material, a large ingot that came with a large batch of scrap lead I recently purchased from an ad on Craigslist, for bullet casting. I was hoping the ingot would be tin. If I know what is the melting point of tin, it would help me identify the mystery material. The ingot is shown here with a set of dykes for scale.
The ingot had some text characters stamped on it. NF FA 281.
Turned out that mystery material isn't tin as I hoped. With a bit of internet sleuthing I learned that FA281 designation is for a 'low melt' alloy comprised of 58% bismuth and 42% indium. I'm assuming the 'NF' in the designation stands for Non Ferrous. Disappointing to me, is there any use for bilsmuth or indium in bullet casting? Do either of these elements have the same effect in helping with fillout that tin adds?