The situation for the 8 x 56R ammo is not completely bleak. Commercial ammo is available from Graf and Sons--but for better than a buck a round.
reloadable brass is a better deal--about .56/round
Graf's does carry a Hornady 205 grain bullet suitable for reloading the 8 x 56R round, which is .329 diameter
As I said--sobering to say the least.
Corrosive surplus ammo, when it is available, is usually in the neighborhood of $1/round. Not worth it, IMHO. The Hornady is just a bit more and is both non-corrosive and reloadable.
Good luck and welcome to the collecting community