R.Marshall,
8x50R Austrian cases are hard to find, especially reasonably priced ones. However, Graf & Sons has 8x56R Hun. cases in stock( primed 79.99/100, unprimed 75.99/100), that are boxer primed, PRVI make. They also stock a variety of 8mm bullets, from .323" to .330". Buffalo Arms has a variety of 8mm bullets as well. Due to the longer neck and more sloping shoulder of 8x56R cases, sizing them to 8x50R Austrian is a pretty easy operation, using only the loading dies( form dies not required). Trim to length and load will result in perfectly useable ammo, which will form to fit the chamber with the first firing. Appropriate powder and primer choice depends on your selected load. There is nothing wrong with the cast bullet you have found and a "pile" of deer have been killed with cast bullets. I think you have a fun project in the works.
Mike
Last edited by Der Ami; 01/11/19 12:14 PM.