Norma 7.7x58 Japanese 174 Grain Jacketed Soft Point Centerfire Rifle Ammo. For some reason they ended up using both rounds during WW II. It uses the same .311 bullets as the .303 British and is very similar in performance. However the 77 Japanese - or the .31 Jap as it sometimes is called - is rimless as opposed to the rimmed case of the .303 British. Like the .303 it could be characterized as an old 8mm-08 and is covers almost the same range of game as the .308 Winchester. Specifications for Norma 7.7x58 Japanese 174 Grain Jacketed Soft Point Centerfire Rifle Ammunition: Manufacturer: Norma Caliber: 7.7x58mm Arisaka Number of Rounds: 20 Bullet Type: Jacketed Soft Point (JSP) Bullet Weight: 174 grain Cartridge Case Material: Brass Muzzle Velocity: 2500 ft/s Application: Medium Game Package Type: Box Primer Style: Centerfire Lead Free: No Dimensions: 1.35 X 3.75 X 6.25 in Package Contents: Norma Ammo 7.7 Jap 174gr. Soft Point 20-pack What is Norma 7.7x58 Japanese 174 Grain Jacketed Soft Point Centerfire Rifle Ammunition good for? The manufacturer says that it is best for medium game.Norma 20177292: 7.7x58 Japanese 174 Grain Jacketed Soft Point Centerfire Rifle Ammo