After a 7-year hiatus from casting, I'm starting again with a custom Accurate 2-cavity aluminum mold. Using my approximation of Lyman #2 alloy, it's casting a 324-gr boolit measuring 0.463" for my Marlin 1895 with the oversized Micro-groove bore (0.4595"). The boolit will be sized to 0.462".
Pot temperature is 720 degrees F.
Before starting I used a Q-tip and brake cleaner to clean the cavities.
After 30 or so throws, the boolits finally came out without wrinkles but are frosted (see image).
The question then is: Do aluminum molds require higher temps/faster casting/etc? I did not see an answer based on my search of the forum.
Thank you, Richard