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Teflon-coated bullets, sometimes colloquially, but incorrectly known as "cop killer bullets", are bullets that have been covered with a coating of polytetrafluoroethylene. ==History== In the 1960s, Paul Kopsch (an Ohio coroner), Daniel Turcos (a police sergeant), and Donald Ward (Kopsch's special investigator), began experimenting with special purpose handgun ammunition. Their objective was to develop a law enforcement round capable of improved penetration against hard targets, such as windshield glass and automobile doors. Conventional bullets, made primarily from lead, often become deformed and less effective after striking hard targets, especially when fired at handgun velocities. The inventors named their company "KTW," after their initials. After some experimentation with sintered tungsten-alloy rounds, which were eventually abandoned due to supply and cost concerns, the inventors settled on a bullet consisting mostly of hardened brass with a steel core. In testing, the comparatively hard brass bullets wore out barrels far more quickly than standard solid lead and copper-jacketed lead rounds, since they did not deform to fit the rifling. In an attempt to reduce barrel wear, the bullets were experimentally coated with a protective layer of Teflon. The inventors, having also noted that the tips of canes were frequently covered with the relatively soft and malleable Teflon to help them grip surfaces, found that the addition of Teflon helped to prevent bullet deflection off of vehicle doors and windshields, further improving penetration against those surfaces.〔(【引用サイトリンク】title=Interview with an inventor of the KTW bullet )〕 By the late 1960s, KTW had begun commercial production. In 1980, continued production of the ammunition was turned over to the North American Ordnance Corporation. The production of KTW-branded ammunition eventually ceased in the 1990s. However, some manufacturers continue to coat their bullets with various compounds, notably Teflon and molybdenum disulfide, as a protective layer against barrel wear. Not a lot of performance data is available for these cartridges, although the 9mm offering was reputed to push a 100grn projectile at a velocity of 1350fps. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Teflon-coated bullet」の詳細全文を読む スポンサード リンク
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