Do you fellows always cast with one mold or more?
I always use two in rotation, while one is cooling and the sprue hardening I'm filling the other one. That generally seems to keep the mold temp from getting too hot but even with that if you have two six cavity aluminum molds for large bullets, say a .45 and a .44, you occasionally have to let them cool down a bit.
I just cast with one usually, because swapping molds slows me down. I tend to cast quickly though, and quench the mold every 5-10 casts to keep it cool enough.
