There were ten or more 75-mm guns in use in the Japanese Army. Though the weapons vary considerably in design, length of bore, and employment, the bore diameter (75 mm) is held constant and in large part the projectiles are designed to be interchangeable for numerous guns. It this vary, identical projectiles may be assembled with different sizes of case and propellant charge to fit the various weapons.

For this reason the cases and propellant charges for the different weapons will be trea-ted separately and the projectiles will be presented as a group of designs which are po-tentially interchangeable for all Army 75-mm guns. The specific purpose of a given pro-jectile or a given projectile or a given gun will limit the occurence of many of the possible combinations.

Ammunition for Japanese Navy guns designated "8 cm" is comparable in size to Army 7-cm, but the Navy guns have a bore diameter of three inches (76.2 mm) and Army and Navy projectiles and ammunition are not interchangeable. Navy guns as well as Army guns are found commonly in shore defenses, but the identity of the installations, wea-pons, and ammunition remains distinctly Army or Navy.

Figure 242 – 7-cm Introductions.