Thread: Chamber casts, what material to use?

Sulphur and graphite is just fine.
It doesn't shrink enough to throw the numbers out enough to matter

Cerosafe I have used and is good but unobtainable in NZ
Hayes metals sells a product they call cerrosafe in NZ but it is for bending metal pipes without collapse and is not suitable for chamber casting

Good quality garden sulphur from the hardware store is what you want and a puffer bottle of graphite from the key cutting department.
Find a youtube tutorial and see how its done

Be warned when melting it in a pot that it is very flamable so if doing on gas in your workshop that the gas flame can ignite the fumes from melting it.
And that it burns with no visible flame but extremely noxious fumes
And you will struggle to put out the flames if you ignite your surphur graphite mix

So do your research and set yourself up properly and safely
The good thing about the sulphur casts is the product is very cheap so you can keep the casts as a reference long term and label them

You can cast them as a barrel slug and test for tight patches.
Or measure a choke and push back to the breech

Very quick and easy once you have learned from someone else's mistakes