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4 mm caliber; An example of a 4 mm cartridge, a 4.25mm Liliput including an example of 1 Euro cent by scale
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4 mm may refer to: 4 mm caliber , gun cartridges between 4–5 mm diameter 4 mm scale , in rail transport modelling, 1:76.2 scale with rails 16.5 mm apart, representing standard gauge in Britain
Although not originally designed for handguns, several rifle and shotgun cartridges have also been chambered in a number of large handguns, primarily in revolvers like the Phelps Heritage revolver, Century Arms revolver, Thompson/Centre Contender break-open pistol, Magnum Research BFR, and the Pfeifer Zeliska revolvers.
The current world distance record on the 4 mm band was 289 kilometres (180 mi) set by US stations AD6IW and KF6KVG / K6GZA on June 14, 2014. [5] [6]The longest distance achieved on 4 mm in the United Kingdom was 129 kilometres (80 mi) between stations G8KQW and G8CUB on November 23, 2013.
Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.
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.177 caliber or 4.5 mm caliber is the smallest diameter of pellets and BB shots widely used in air guns, and is the only caliber generally accepted for formal target competition.