I made up a 9.5x68 many years ago and wrote it up here, I am sure. That was back in the free photobucket days.
I had some 8x68S brass, but mostly used .375H&H brass. I would turn the belts down to .522", then trim to length and fireform.
Instant good brass. They had a couple gr. more or less capacity than RWS 8x68 brass. IIRC, they held more powder.
The case body formed out to fill the chamber.
My best friend Keith's brother ended up with it, then had it re-barreled (Keith and I wore out the bore) and re-chambered to the same ctg.
I was shooting a lot of trimmed down .223 brass made into bullets without annealing them. That might have been the reason for the wear.
I don't think we put more than about 3,000 rounds through it.

Seems to me I used a .300 Win Mag die I bored the neck out with a carbide drill for a sizer. I made a seating die like the current Hornady seating dies with a sliding collar and fixed seating post.

edited - belts turned down from .532" to .522".