Rhinochugger
Retired Oik

White metal has quite a few uses, but in modelling terms, when I used to make white metal 4mm/1ft kits, the metal was largely lead, and the kits were assembled with 80 degree low-melt solder.There are no fixed parent metals for the alloy referred to as whitemetal: White metal - Wikipedia
I've done plenty of casting in the past -mostly aluminium- but it's not something I'm planning on doing at home!
Nowadays, the preferred metal for casting tiny bits is pewter as a substitute for the lead-based white metal. It's not so soft, and takes a bit more working - finishing off with a fibreglass brush doesn't work

Over the years, I have used a few lost wax castings - these tended to be brassy in colour and quite hard, and generally were glued in place.