I just finished casting twelve pounds of lead in my new Lee 405 gr mould for my .45-70. I have casted .30 cal in a single mould and never had any problems with the mould getting too hot. Today I guess with the big bullets and double mold things were heating up fast, even though it was just above freezing.
I first realized it when the sprue was very thin just covering the plate and not joining the two together. I cooled the mould down and things went back to nornal, but it soon heated up again. I tried lowering the temperature of the lead, but that didn’t make much difference. The interesting thing is when it was hot I got some of my best boolits.
Is there anything wrong with working with a very hot mould? Will it effect the quality of the boolits or damage the mould? I am working with almost pure lead.
Thanks for your ideas and input on this.