After a period of service, it was realized that the soft lead bullet could arguably contravene the Hague Conventions, which outlawed the use of bullets designed so as to "expand or flatten easily in the human body". A new cartridge was therefore adopted as "Cartridge, Pistol, .380 Mk II" or ".380 Mk IIz", firing a 180 gr (11.7 g) full metal jacket bullet. The .38/200 Mk I loading was retained in service for marksmanship and training purposes. However, after the outbreak of war, supply exigencies and the need to order readily available and compatible ammunition, such as the .38 S&W Super Police, from U.S. sources forced British authorities to issue both the .38/200 Mk I and MkII/IIz cartridges interchangeably to forces deploying for combat.