 Later on in 1912, the round was improved into the "balle D am" ("am" stands for ""amorcage modifié"" or "modified primer"), done by crimping the primer in more deeply to prevent primer expulsions when fired in machine guns.This ammunition was in near-universal service during World War I (1914–1918) in all Lebel-caliber weapons.The "balle D am" ammunition was followed in 1932 by "balle N" ammunition, which featured a lead-cored, cupro-nickel-over-steel-jacketed, pointed boat-tail bullet weighing 15.0 g (232 grains).