BTW, I bought 9.5x57 brass from Buffalo and a set of dies from CH4D. These work very well.
Buffalo reforms 35 Whelen into 9.5x57.

I have made 9.5 brass from 8 mm mauser. I expanded the neck in a couple of steps to 40 cal and then formed the brass back to 375.

With all reformed brass that I rework or buy, I anneal the brass before reloading. Otherwise, I get splits in the neck.

I reload my 9.5 with 235 gr bullets which are great for paper and deer.