Norma 9.3/74 brass is thin compared to RWS and subsequently will not handle as many reloads before seperation becomes an issue.
Some 9.3/74 owners only get 2 firings from Norma brass while others get more.
Influencing factors include...
How much pressure the handload is producing
Strength and condition of the rifles action
Chamber tollerances including headspace measurement
Die internal dimensions/tollerances
Adjustment/setting of the full length size die being used

Matching die dimensions to chamber dimensions and carefull die set up can dramaticly increase case life.

HTH