The 330mm/50 Modèle 1931 gun was a heavy naval gun of the French Navy. The built-up gun was carried by the Dunkerque-class fast battleships, in quadruple turrets inspired by those intended for the Normandie class. They had one of the longest ranges, while firing quite powerful projectiles: APC – 560 kg (1,230 lb) and HE – 552 kg (1,217 lb). The range was over 40 km in both cases; the trajectory was flat. Dunkerque's guns were affected by inaccuracy caused by their quadruple mounts (too close together), but could engage German battleships of the Scharnhorst class with enough power to pierce their armour: at 0 metres, the shell could pierce 713 mm (28.1 in), at 23 km (14 mi) penetration capability was 342 mm (13.5 in) and 292 mm (11.5 in) at 27.5 km (17.1 mi). Theoretically, it could pier