Which ammo to use for barrel break in, Wolf or Hornady AG?

[Grendelshooter]

Wolf bullets are actually a little undersized unless their new stock has been corrected. That said, I wouldn't break in any rifle with non-brass cases. Stick to factory offerings of brass cased cheaper priced offerings like the American Gunner or PPU.

I don’t think the cases have anything to do with it, a proper rifle can run steel case with ease.
Bi-metal jackets though, yeah those might be a bit more abrasive than copper.