Cartridge Case Flashcards
This is the part of the cartridge case serves to limit the forward travel of cartridge into the chamber and the clearance between the head and support surface of the bolt or breech block
Rim
This part has three functions; to hold primer in central position, to prevent gas from escaping to the rear of the cartidge, and to provide solid support
Primer Pocket
Also called flash hole, this part provides a passage of heat and flame from the primer pocket towards the gunpowder chamber
Vent
This is the ‘cork’ that plugs the breech to prevent gas from escaping at the rear of the gun barrel. For bottleneck shaped cartridges, the cork includes the shoulder and the neck
Body
This is the part that is occupied by the bullet, which is true for rifle and machine-gun cartridges
Neck
This is composed of serrated grooves found at the interior surface of the neck which has a dual function: to serve as lubricant groove and to prevent the bullet from being pushed or pulled
Cannelure
This acts as the lip since it is found at the periphery of the mouth of the cartridge case. It has also two functions, to aid in holding the bullet in place and to resist the initial forward motion of the bullet while the gunpowder undergoes combustion
Crimp
The part that supports the neck of the shell which is true to rifle and machine-gun cartridges
Shoulder
This is the bottom part of the case that contains the primer, rim and headstamp
Base
The bottom surface of the shell that contains engraved data such as the manufacturer’s ID, caliber and year of manufacture
Headstamp
This is circular groove near the base of the shell designed for automatic withdrawal after each firing
Extracting groove
Types of Shells According to Shape
This description of shell is true to pistol and revolver ammunition. This is the casing of all rimmed cartidges for revolvers and all center-fire pistol ammo that are now manufactured
Straight Case
Types of Shells According to Shape
This is the casing of most modern center-fire rifle ammunition. This is the type of shell that provides the greatest power capacity commensurate with over-all case length
Bottleneck Case
Types of Shells According to Shape
This is an obsolete type of case. It is very rare but presently being used in magnum jet cartridge of caliber .22 firearms
Tapered Case
