 This made it more difficult to feed from standard magazine firearms such as the Berthier rifles and the Chauchat machine guns, and is the reason for the distinct curvature in the magazines of those firearms.The Lebel rifle from which it was fired was also rather outdated by the time "balle D", let alone the "balle N", came along.A "balle N" round can only be fired from Lebel or Berthier rifles, if the chamber has been reamed to accept the larger neck of the N-type cartridge.