My post disappeared, will try again...
The Shooting Edge has/had/will have surplus 7.5 Swiss. It's Berdan primed but I'm fairly sure it's non-corrosive. If reloading is an option, 7.5 Swiss brass can be had from Privi/Norma/Grafs and can be sourced from places like BC Redneck, Trade Ex, and Ellwood Epps. A great alternative is to take .284 Win brass and use that. After one resize/trim (I use a Lee case length gauge/cutter) it works just fine. The advantage to .284 Win brass is availability, quality, and cost.