The 5.45×39mm cartridge is a rimless bottlenecked intermediate cartridge. It was introduced into service in 1974 by the Soviet Union for use with the new AK-74.
The 5.45×39mm gradually supplemented, then largely replaced the 7.62×39mm cartridge in Soviet and Warsaw Pact service as their primary military service rifle cartridge. 5.45x39 is popular today, both in the United States and across the world.
The 5.45×39mm cartridge was developed in the early 1970s by a group of Soviet designers and engineers under the direction of M. Sabelnikov. The 5.45×39mm is an example of an international tendency towards relatively small-sized, lightweight, high-velocity military service cartridges.
|3.43 g (53 gr) 7N6 FMJ mild steel core||880 m/s (2,900 ft/s)||1,328 J (979 ft⋅lbf)|
|3.43 g (53 gr) 7N6M FMJ hardened steel core||880 m/s (2,900 ft/s)||1,328 J (979 ft⋅lbf)|
|3.62 g (56 gr) 7N10 FMJ enhanced penetration||880 m/s (2,900 ft/s)||1,402 J (1,034 ft⋅lbf)|
|3.69 g (57 gr) 7N22 AP hardened steel core||890 m/s (2,900 ft/s)||1,461 J (1,078 ft⋅lbf)|
|5.2 g (80 gr) 7U1 subsonic for silenced AKS-74UB||303 m/s (990 ft/s)||239 J (176 ft⋅lbf)|
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