I've not used casinite and I don't think you can buy it anymore.
I have case hardened and heat treated BP gun parts by packing them in a metal box with leather scraps and heating them over a propane burner for an hour letting it glow, and then quenching. Then I polished the piece and re-heated watching the colors change until I got a straw color and then quenching again. The lead pot idea has been suggested to me and lets you more accurately control the quench temperature.
Here is a great book on heat treating alloys and temps:
http://www.secowarwick.com/assets/Do...EBook.2011.pdf
Steve