I have two types of molds, aluminum and iron. I do find that I like casting with my iron molds more because they do keep up with the temperature for good bullet casting and I don't have to get in a hurry with them. I have a different tempo for my aluminum molds but with both types, it doesn't take long to fall into a groove. I also have my hot plate handy to place my molds on for when I want a little break or to fix a drip. Anymore though, by the time I get through one or two pots, I'm done and have enough bullets to keep me in fun for awhile.