After few weeks of experiments: obtaining brasses from .28 nosler is an hard way. It's a long work that includes working on the rim diameter to reduce it, shortening the total lenght and moving down the shoulder. My council is to try to find original brasses until it's possible. I have made 3 brasses in total from 28 nosler, with an high dispersion of time. After all this could be the last way to use your gun without original brasses. Go for Gehmann brasses if you can.
Doc