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Concentric fractures- patterns of cracks in glass pierced by a missile like a bullet which runs between the radial fractures and which originate on the side of the glass from which the impact came.Copper-clad steel - a composite structure of copper and steel used for the manufacture of certain bullet jackets.Metallic element with the chemical symbol Cu and atomic number 29 that commonly comprises "cartridge brass" that is typically 70% copper and 30% zinc (Zn)Centerfire- is a cartridge with a primer located in the center of the cartridge case head.Unlike rimfire cartridges,the primer is a separate and replaceable component.Chamber- is that portion of the barrel or firing cylinder in which the cartridge is inserted prior to being fired.Clay pigeon shooting - (clay target shooting) formally known as inanimate bird shooting is the art of shooting at special flying targets known as clay pigeons or clay targets with a shotgun or any type of firearm.Cylinder- rotating chambered breech of a revolver. Damascus barrel - an obsolete barrel-making process.The barrel is formed by twisting or braiding together steel and iron wires or bars.The resulting cable is then wound around a mandrel and forged into a barrel tube.This typeof barrel is also called a laminated barrel.
Decant- the process of pouring off the supernatant during separation from a pellet after a mixture has been centrifuged or left to settle.Derringer- the generic term applied to many variations of pocket size pistols either percussion or cartridge made by manufacturers other that Henry Derringer up to present time.Discharge- to cause a firearm to fire.Disconnector- a device to prevent a semi-automatic firearm from firing full automatic.Some pump action shotguns also have disconnectors.Distance determination - the process of determining the distance from the firearm, usually the muzzle, to the target based upon pattern of gunpowder or gunshot residues deposited upon thattarget.Where multiple projectiles such as shot have been fired,the spread of those projectiles is also indicative of distance.Double action- a gun action where the pulling of trigger to fire a round recocks the gun so that the next round is ready to be fired.Drawback effect - the presence of blood in the barrel of a firearm that has been drawn awkward due to the effect created by discharged gasses.This is seen frequently in close-range contact gunshot injuries.Driving edge,fired bullet- the driving edge of a fired bullet with a right twist is the left edge of the groove impression or the right edge of the land impression.The driving edge of a fired bullet with left twist is the right edge of the groove impression or the left edge of the hand impression.Ejection- the act of expelling a cartridge or cartridge cases from a firearm.