Many thanks Daryl. I am just about to start working on loads for my "new" Haenel 9x57. I was thinking of loading them up with .357 bullets and fire forming. Your process should eleminate the need to fireform. I have the C&H version of the expander as you show. I will be starting with some Czech brass I have in 8x57. My barrel slugs just at .358. I hope the chamber neck goes along with that.
I will eventually post some info after I try it out.
Best and cheers.