I do a bit of lead welding as a builder, it'll melt quite quickly with a blowtorch, I'd melt some in an old saucepan with a blowtorch outside then pour into a mould, could use a very dry piece of wood (or the moisture will vaporise and spit molten lead at you) bored out to few mill oversize and length, the wood will burn to a degree, and could be sunk into a bucket of sand for stability and to work as a heat sink. Once cooled split off the wood.