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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 7.62 mm designation refers to the internal diameter of the barrel at the lands (the raised helical ridges in rifled gun barrels). The actual bullet caliber is often 7.82 mm (0.308 in), although Soviet weapons commonly use a 7.91 mm (0.311 in) bullet, as do older British (.303 British) and Japanese (7.7×58mm Arisaka) cartridges.
The .308 Winchester is measured across the grooves and uses a .308-in diameter (7.82-mm) bullet; the military-specification version is known as 7.62 × 51 mm NATO, so called because the bore diameter measured between the lands is 7.62 mm, and the cartridge has a case 51 mm long.
Its 39.37 mm (1.55 in) length makes it slightly longer than the 7.62×39mm case which measures exactly 38.60 mm (1.52 in). The primer has a copper cup and is sealed with a heavy red lacquer. The propellant charge is a ball powder with similar burning characteristics to the WC844 powder used in 5.56×45mm NATO ammunition. The 7N6 cartridge ...
Since there are many users in the U.S. that had adopted the 9×39 round prior to the import ban, were forced to reload their own ammunition. However, there are multiple companies worldwide who make 9.3mm (.366") Mauser bullets which are suitable for reloading in the 9×39, including Hornady, Barnes, Nosler, Prvi Partizan, Lapua, and others.
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 ...
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]
Length; Name of unit Symbol Definition Relation to SI units ångström: Å ≡ 1 × 10 −10 m: ≡ 0.1 nm astronomical unit: au ≡ 149 597 870 700 m ≈ Distance from Earth to Sun