There are three 150-mm howitzer and four 150-mm guns in use by the Japanese Army. These weapons vary greatly in design from a very short-range howitzer to long-rang field guns.

The projectiles for 150-mm ammunition are not as interchangeable as in the 75-mm or 105-mm sizes. Usually there is one type of projectile designed for use in the howitzer and another type designed for use in the guns. Even when the same projectile is used in both howitzers and guns, it will differ in that it will have a single rotating band when it is used in a howitzer, but when used in a gun it will have a double rotating band.

All the weapons with the exception of the type 89 gun, which uses a bag charge, use semifixed ammunition.

The cases and projectiles will be treated separately, as was done with 75-mm and 105-mm ammunition.

Figure 281 – 15-cm Ammunition.