I know you can use Sulfur to make chamber castings. There is also a commercially produced low-melt alloy that goes by the name Cerro-Safe.
I've used the Cerro-safe chamber casting alloy. It is a low-melt metal that looks similar to solder, you pour it into a plugged chamber and when it cools you have an accurate casting of the chamber.
I plugged the chamber with a piece of paper towel wrapped up and stuffed down into the bore so that I got a casting of the throat as well as the chamber. It didn't take long to melt, but I did not like the fact that I had to use a frying pan to melt the metal... I hate wasting a dish for something I am going to do maybe half a dozen times, ever.
I have not used sulfur for chamber casting. Yet. Has anyone done this before?
Is it the same melting process for any kind of sulfur, or are there specific sulfur compounds to use? I'm not really concerned with the mess it will make because I'm doing all of this in my garage.
I have a large bag of lawn-grade sulfur that is intended for pest control. I wish to use this if possible instead of buying more cerrosafe. It is a more dusty kind of sulfur, not the pellets or granules that I had in my chemistry set so many years ago. I remember the pellet sulfur was melted with low heat on an oil burner with my desktop chemistry set, and it was fun to drop the melted sulfur into water to make little yellow balls. I don't remember what else I did with it except try to make gun powder. Kids and their chemistry sets!
I'm curious to hear other people's experiences with sulfur casting. I didn't find much doing a search for "chamber casting sulfur"... I thought there would be more documentation about it. I'm going to poke around some reloading forums to see if I can find more.