 Furthermore, a heavier shell was proposed but not adopted because of stringent budget policies of the 1930s; therefore, this naval gun wasn't seen as particularly successful.An improved weapon, the BL 16-inch Mark II was designed for the "Lion"-class battleship which was a successor to the "King George V" class taking advantage of the larger weapon allowed under the London Naval Treaty from March 1938.This "new design" of 16-inch gun fired a shell that weighed .