I don't cast, yet...

[mgderf]

...but I have a couple of friends that do, but some for different reasons.

I was given a small bar of what appears to be lead, but is marked,

"Sn60     B.S. KESTER SOLDER   E   1lb    Sn60"

One friend casts for bullets, another casts for fishing weights.
Who do I take this to, and what composition do I have?
Can anyone here shed some light?

Thanks in advance.

[JSilva]

The Sn 60 part is telling you the bar is 60% Tin. The remaining would be lead Pb.
Your bullet casting friend would certainly have use for it.