7.7×58 Type 99
This round was adopted by Japanese army in 1939 (2599 per Japanese calendar then in use) as an improved version of the earlier 7.7mm Type 92 round. The Type 99 round was intended for use in both rifles and machine gun, and differend from Type 92 by having a rimless case and a slightly lighter bullet. No weapons for this round were made after the end of WW2, and today it is strictly obsolete.
Designation Bullet weight, g Muzzle velocity, m/s Muzzle energy, J Comments
Type 99 11.6 760 3360 with pointed FMJ bullet, from rifle barrel