Start with a brand new Lee six cavity mold.
Degrease with Berryman's B-12 ( twice )
Degrease with 409 and hot water ( twice more )
Heat the alloy to 725 to 740 degrees. Flux with
Note that at this temperature, the paraffin will
self-ignite. I use this as my primary temperature control.
If the flux fumes do not self ignite, the alloy is not hot
Normally in this procedure, I fill and dump the mold as
fast as possible without inspecting the bullets until they
begin to look well formed. I am careful to pour as large a
sprue puddle as possible because this extra melted alloy
adds significant heat to the mold. This usually takes
about eight to ten fillings.
For this experiment, the pace was significantly slower
than normal due to rounding up and segregating the bullets
from each filling so I could identify them later. The pace
was approximately one minute per filling.
Each filling produced six bullets. I attempted to chose
the "average" bullet for the group.
No. 1 Completely cold mold.