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•List the class and individual characteristics of bullets and cartridge cases.
Class characteristics include general features such as the number of lands and grooves and their width, direction of twist, and bullet diameter. [ Since many firearms are built to the same specifications, the variation of these characteristics will be nominal from multiple guns of the same make and model. However, the individual characteristics imparted to a bullet or cartridge case are different for every firearm, and make it possible for an examiner to positively identify Single Imagea round of fired ammunition as coming from a specific gun. Individual characteristics can be further
classified into impressed or striated marks. Impressed marks are made by a hard surface imprinting its shape into a softer material. These marks include those made by a hammer striking another piece of metal, or a screwdriver driven straight down onto another surface. Striated marks are cause when a hard surface scrapes against a softer surface, such as pry marks made by a crowbar or when the surface of the bullet is forced along the rifling inside a gun barrel ]
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Expert answered|selymi|Points 10586|
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Asked 6/3/2013 10:29:36 AM
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