I also bought a .28 Nosler Ridgeline, I've never fired a factory round and made my brass by necking up .26 Nosler cases. I was getting ejector marks and smears as well, trying to load even mid-range book loads. Just for instance Nosler lists 80.0 grains of Retumbo being a mid-range load. I'm loading 78.5 grains and anything higher, ejector marks. My velocity is right at 3100 fps and accuracy is good, so it's good enough for me. I had pulled ejectors, cleaned up edges, trimmed springs slightly, etc. Just had to back down the loads and everything is good.