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An IMR smokeless powder for reloading The Hagley Museum in Wilmington, Delaware. IMR Legendary Powders is a line of smokeless powders which are popularly used in sporting and military/police firearm cartridges. The initials 'IMR' stand for Improved Military Rifle powder. IMR powders makes a line of various types of smokeless powder suitable for ...
By 1936 improved DuPont process control produced batches conforming to published reloading data rather than requiring different charge specifications for each batch; [11] and those propellants have remained in production. Non-conforming batches were used to load commercial and military cartridges following traditional testing procedures.
The C was to indicate the powder burned "cooler" than traditional Improved Military Rifle (IMR) powders. [4] In 1949, he began acquisition of powder salvaged from disassembled Oerlikon 20mm cannon cartridges. This powder resembled IMR 4350 in appearance, and with a slower burning rate, was initially marketed as "4350 Data", and later as 4831. [5]
Availability of DuPont's Improved Military Rifle (IMR) powders encouraged commercial release of the .257 Roberts using the 57 mm Mauser case in 1934. [8] Release of IMR 4350 in 1940 and availability of surplus 4831 powder salvaged from Oerlikon 20 mm cannon cartridges after World War II greatly improved performance of the full-length .25-06 ...
The shortening of the case allowed for the more efficient use of the slow powder of the day, IMR 4350; [2] a powder which would not have provided any great advantage for such cartridges as the .257 Weatherby Magnum or the .270 Weatherby Magnum if such cartridges utilized the full length H&H case. Today, IMR 4350 is considered too fast a burning ...
Finnish smokeless powder. Smokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to black powder. Because of their similar use, both the original black powder formulation and the smokeless propellant which replaced it are commonly described as gunpowder.
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DuPont at one time shipped DuPont No. 4350 powder to Norma Projektilfabrik for the reloading of Weatherby ammunition. But some time later Norma was able to source a powder with similar burn characteristics locally which was used instead of DuPont's IMR 4350. [6] Norma would later purchase the company and rename the powder Norma 204.
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