Will a 28 nosler reamer clean up a 7ss chamber?

[DJ Fergus]

Will a 28 nosler reamer clean up a 7ss chamber?

 

[7.62 Gunner]

It should, you may have to set the barrel back a little depending on the taper difference between the two.
Easiest way to know for sure would be to measure the diameter of the ss at the shoulder junction, and compare to the nos case at the same datum mark.