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The maximum radius was now attained at some 15.95mm from the tip and the overall length of the bullet increased to 26.8mm. To preserve the total length of the cartridge, the case sleeve was shortened to 38.7mm (and by rounding it is customarily referred to as 7.62×39.) Additionally, the new bullet had a core made of lead wrapped in low-carbon ...
The overall case length after the shortening and re-sizing is 1.565". The cartridge was designed to use .308" diameter bullets in weights of 110 to 150 grains, with a standard twist rate of 1-12". [1] Wilson Combat states that heavier bullets can be used in a barrel with a 1-8" twist rate for subsonic loads. [4]
Valmet M76 (milled) – a civilian semi-automatic variant of the RK 62, produced in .243 Winchester, 7.62×39 and .308 Winchester. Valmet M78 (stamped) – an export variant of the RK 62 76 with a strengthened front trunnion, heavier barrel and sight layout of the RK 71, which led to external resemblance to the Soviet RPK. Developed separately ...
≡ 2.54 cm ≡ 1 ⁄ 36 yd ≡ 1 ⁄ 12 ... = 308.057 599 609 375 ... 1 ⁄ 100 of the energy required to warm one gram of air-free water from 0 °C to 100 °C at a ...
The 9×39 is based on the Soviet 7.62×39mm case but with the neck expanded to fit a 9.2mm bullet. The final design was completed by N. Zabelin, L. Dvoryaninova, and Y. Frolov of the TsNIITochMash in the 1980s. The intent was to create a more stealthy cartridge for suppressed firearms used by Spetsnaz and other special troops that had more ...
Producers mark these cartridges differently, and this leads to confusion among the customers – 7.62х53; 7.62×53R; 7.62х54; 7.62×54R. The confusion is based on difference in rounding out (rounding up or rounding down) the case length (case length of our cartridges is 53.65-0.2 mm). The letter "R" indicates a case rim.
Improvements were made to the initial design from the 1970s which made the rifle capable of handling more powerful cartridges such as the .308 Winchester/7.62×51mm and the more prevalent .223 Remington/5.56×45mm, 5.45×39mm, and 7.62×39mm calibers. These improvements contributed to the modern line of the Saiga rifles being adopted by many ...
Due to the large case capacity in relation to the 7.62 mm (.308 inch) calibre bore size the round is harsh on barrels like other .300 Magnum cartridges. In an Austrian based online forum "Leuchtspur.eu" the inventor Michael Uekötter claimed he needed to replace his Krieger custom barrel after more than 4,000 shots with the 7.62 mm UKM. A lot ...