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The 5.8×42mm / DBP87 is a military bottlenecked intermediate cartridge developed in the People's Republic of China. There is limited information on this cartridge, although the People's Liberation Army claims that it is superior to the 5.56×45mm NATO and Soviet 5.45×39mm cartridges.
Wikipedia
Base diameter: 10.40 mm (0.409 in)
Case capacity: 2.11 cm3 (32.6 gr H2O)
Used by:
People's Liberation Army
The 5.8×42mm is an example of an international tendency towards relatively small-sized, lightweight, high-velocity military service cartridges. Cartridges like the Belgian
5.56×45mm NATO, Soviet
5.45×39mm, and Chinese 5.8×42mm allow a soldier to carry more ammunition for the same weight compared to their larger and heavier predecessor cartridges, have favourable maximum
point-blank range or "battle zero" characteristics and produce relatively low
bolt thrust and
free recoil impulse, favouring light weight arms design and automatic fire accuracy.
[2]
In June 2004, an improved version of the 5.8×42mm cartridge entered development as the matching ammunition for the revised assault rifle, Type 95-1. Both designs were finalized in 2010 and production began the same year. This new cartridge is known as DBP10.
To improve accuracy and barrel life the barrel was also redesigned. The number of rifling grooves was increased from 4 to 6. The diameter of the lands was slightly increased from 5.8–5.84 mm (0.228–0.230 in) to 5.82–5.86 mm (0.229–0.231 in). The groove diameter was decreased from 6.01–6.07 mm (0.237–0.239 in) to 5.98–6.02 mm (0.235–0.237 in). In addition, the twist rate in the revised 95-1 assault rifle was reduced from 240–210 mm (9.4–8.3 in).These changes reduced the
rifling twist rate from 41.2 to 36 calibers.
The
People's Liberation Army claims that the 5.8×42mm is superior to the
5.56×45mm NATO SS109 and the
5.45×39mm 7N6; stating it has better armor penetration of 10 mm (0.39 in) at 300 m (980 ft), a flatter trajectory, and a higher retention of velocity and energy downrange.