 It uses 8.2 mm (.320") bullets.Power is relatively low, with military loads developing about 280 J (200 foot·pounds), comparable to the American .380 ACP and substantially weaker than contemporary military cartridges such as 9×19mm Parabellum, .45 ACP, and 7.62×25mm Tokarev.Like almost all of the Imperial Japanese weapon designs of that era, production of 8 mm Nambu ammunition ceased after the end of World War II, as the weapons that fired it were removed from service.