Yamaha K-31 Service Manual download pdf (Page 49)

68, 69

Part 2

Munitions

I. Overview

47 Ammunition for long rifle, musketoon (short rifle), Automatic rifle, and machine gun are

delivered to troops ready to fire. They are all the same.

The cartridge is composed of the bullet (projectile), the propulsive charge, and the case.

The bullet is inserted into the neck of the case. In order to hold the bullet tightly and seal the

interior of the case, the case neck is crimped into a circular groove near the base of the bullet. In

addition, a grease ring at the neck crimping seals the cartridge.

The propulsive charge placed inside the case, is composed of stick powder, which produces very

little smoke upon discharge (nitrocellulose).

The case is composed of brass. The sides of the case gradually thicken near the base. The primer

is placed in a special pocket located in the base of the cartridge. When a shot is fired, the point of

the firing pin strikes the center of the primer where the percussion material is placed. The

percussion material then creates a spark that ignites the propulsive charge.

The manufacturing data for the cartridge is stamped onto the base of the cartridge around the

primer. The letters and numbers indicate the following information:

Left Letter: Source of the case material

Right Letter: The initial of the munitions factory

Upper Number: Month of manufacture

Lower Number: Year of Manufacture

Common Rifle Cartridge 11 Armor Piercing Cartridge Tracer Cartridge

Fig. 29 Ball Cartridges

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 81 82

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Yamaha K-31 Service Manual Page 49