Case - A tube, usually made of plastic
or paper, with a steel or brass head. It contains the powder charge, the
primer and shot.
Crimp - The portion of a cartridge case that is bent inward to hold the
shot in place.
Powder - The general term for any
chemical compound or mixture used in firearms that burns upon ignition. The
gases produced by this rapid combustion propel the bullet down the bore. One
major type is black powder, which is a mixture of charcoal, sulfur and
saltpeter. It's used in older cartridges. Another major type is smokeless
powder, which is principally used in modern ammunition. It's a granular
nitrated chemical compound.
Primer - The collective term for the
chemical primer compound, cup and anvil. When the primer is struck, it
ignites the powder charge.
Shot - Small, round pellets of
lead, steel or bismuth. These are the projectiles in a shotshell.
Wad - A disc used to separate
powder from shot, to seal propellant gases behind the shot or to hold shot
together in the barrel.