Get on graf and sons and get some 325 wsm Bertram brass, way better than the lot of Norma brass I had previous. One pass thru FL 300 wsm and good to go.
I've had issues with norma 300 wsm brass. 3,firings and the bolts get sticky with low Pressure loads. I don't have that issue with hornady 300 wsm brass.
I think the brass is just soft for some reason.