I would skip the Norma brass and run either ADG or Peterson if you can find it. Have 5-6 loadings on ADG 300wm brass running 215 Bergers at RUM velocities with no issues yet.
You need to clarify because there are guys running over 3100 with a RUM and 215s. I can run my 30 Nosler up to 3100 with no pressure with 215s and H1000. You are NOT running a 300 WM that fast. I have had three 300WM tubes and even with long barrels and slow powder can't get there.