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Improved Military Rifle
Improved Military Rifle (IMR) describes a series of tubular nitrocellulose smokeless powders evolved from World War I through World War II for loading military and commercial ammunition and sold to private citizens for reloading rifle ammunition for hunting and target shooting. These powders were DuPont modifications of John Bernadou's 1897 Naval Torpedo Station patent for nitrocellulose powder colloided with ether and alcohol.〔Davis, Tenney L. ''The Chemistry of Powder & Explosives'' (1943) pages 296-297〕 IMR powders are coated with dinitrotoluene (DNT) to slow initial burning and graphite to minimize static electricity during blending and loading. They contain 0.6% diphenylamine as a stabilizer and 1% potassium sulfate to reduce muzzle flash.〔Davis, William C., Jr. ''Handloading'' (1981) National Rifle Association pp.31–32〕
IMR® is a registered trademark of the IMR Powder Company assigned to the Hodgdon Powder Company, which markets powders under that name.
== IMR # 3031 ==
IMR # 16 appeared in 1916 with grains 0.03-inch diameter and 0.085 inches long. Through World War I this powder, and the similar IMR # 17, were used to load military rifle cartridges for France, Russia, and the United Kingdom. In 1923 IMR # 17½ added 2% tin to IMR # 16 to reduce metal fouling from cupronickel-jacketed bullets.〔Sharpe, Philip B. ''Complete Guide To Handloading'' (1953) Funk & Wagnalls pp.163–172〕 Grains of 0.03-inch diameter were 0.084 inches long with 8% DNT coating.〔 IMR # 3031 replaced IMR # 17½ in 1934. IMR # 3031 is intended for mid-range loads and medium sporting and military cartridges like the .257 Roberts, .30-30 and .348 Winchester.〔 Grains of 0.029-inch diameter are 0.083 inches long with 7% DNT coating.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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