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The nominal length of N559 is 32,7 mm – just I already wrote to you.
There is a certain tolerance for that length which can bit vary according to the weight of bullet.
That mean the bullet weight is 11,7 g (+-0,1g) in the most important measure and we can bit “tune” the length inside those tolerances in order thta the correct weigh is achieved for the bullet.
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O-Ton Lapua auf meine Nachfrage wie sich die Abweichungen erklären. Macht Sinn sage ich jetzt mal als Laie.