Hope you're able to get some ammo put together and shooting. There are a few botique shops that make bullets for it, and a couple that sell bullets, brass, and loaded ammo.

BA has loaded ammo and brass in stock, but it's salty.

https://www.buffaloarms.com/35-wsl-cases-bertram-box-of-20-ber35wsl.html

https://www.buffaloarms.com/35-wsl-180-grain-hawk-bullet-amo35wslhawk.html