Making Tin or Zinc bullets.

Bismuth has a low melting point, so it might work. The melting point of tungsten is orders of magnitude higher than any of the metals used to make bullet moulds, so that's not going to work.
 
It can be done, though.
It can be hard to tell what you are getting, though. All google references I see to Speer African Grand Slam bullets say tungsten carbide core.
I think the Alaskan bullets of about 50 years ago had metallic tungsten cores but I no longer have the manual to be sure.
First generation KTW pistol armor piercing had tungsten alloy cores.

There was a frangible bullet design made of zinc stranded cable in a copper bullet jacket, but sintered tin-copper powder metal pretty much rules the roost.
 
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