A decent casting session with an old Lachmiller 250gr 2 cavity .433" SWCGC mould with metal known to cast OK:


Sorted by weight in 0.1gr increments

And what happens when fighting the metal during the range recovery test:



Oddly, some of the heavier bullets have poor fill-out, due to a higher lead content for both factors.

One of these days it would be nice to try a "store-bought" alloy of known composition!