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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.
They are available in crimped and open-ended (balloon) varieties and are made using both black powder and smokeless powder. The black powder blanks produce not only a loud report and flash, but also a cloud of white smoke.
All smokeless powders are somewhat difficult to ignite in a gun, so that in order to prevent hang-fires every cartridge has a primer or igniter, of ordinary fine grain gunpowder, placed so as to intercept the flash from the tube; the outside of the bag containing this igniter is made of shalloon, to allow the flash to penetrate with ease. The ...
Military rifle propellant was manufactured in batches in a procedure taking about two weeks [7] from treating cotton linters with nitric acid, through curing the extruded grains to evaporate excess ether and alcohol, and finally coating the dried grains with DNT and graphite.
By the late 1890s, safer smokeless powders had been developed, including improved and stabilized versions of "Poudre B" (e.g. Poudres BN3F and BPF1), and ballistite and cordite from the late 1880s. The guncotton problem is not completely solved even today, as an occasional batch of smokeless powder will still deteriorate, although this is ...
Source(s): Vihtavuori Powder N570 Lapua (690 mm; 27.15 inches) barrel [1] [2] [3] The .338 Lapua Magnum (8.6×70mm or 8.58×70mm) is a Finnish rimless, bottlenecked, centerfire rifle cartridge . It was developed during the 1980s as a high-powered, long-range cartridge for military snipers .
The 6.5×47mm Lapua (designated as the 6,5 × 47 Lapua by the C.I.P.) [1] is a smokeless powder rimless bottlenecked rifle cartridge that was developed specifically for 300–1,000 m (328–1,094 yd) competition shooting by ammunition maker Nammo Lapua and the Swiss rifle manufacturer Grünig & Elmiger AG in 2005. [2]
Nitrocellulose, the primary component of modern smokeless powder, has a relatively low autoignition temperature of around 160–170 °C (320–338 °F). [3] Contrary to popular myth, this will not cause the machine gun to "runaway" at cyclic rate of fire (as compared to a slamfire ) because each chambered round has to first be brought up to ...