page_title: FN 5.7×28mm
section_title: Cartridge dimensions
hierarchical_section_title: FN 5.7×28mm / Cartridge dimensions
caption_attribution_description: English: From left to right: 4.6x30mm, 5.7x28mm, .30 M1 Carbine
context_page_description: The FN 5.7×28mm
  is a small-caliber, high-velocity, smokeless powder, rebated rim, bottlenecked centerfire cartridge designed for handgun and personal defense weapon uses and manufactured by FN Herstal. It is similar in length to the .22 WMR and to some degree similar also to .22 Hornet or .22 K-Hornet. Unlike many new cartridges, it has no parent case; the complete package was developed from scratch by FN.
  The 5.7×28mm was developed in conjunction with the FN P90 PDW and FN Five-seven pistol, in response to NATO requests for a replacement for the 9×19mm Parabellum cartridge.
  In 2002 and 2003, NATO conducted a series of tests with the intention of standardizing a PDW cartridge as a replacement for the 9×19mm Parabellum cartridge. The tests compared the relative merits of the 5.7×28mm cartridge and the 4.6×30mm cartridge, which was created by Heckler & Koch as a competitor to the 5.7×28mm. The NATO group subsequently recommended the 5.7×28mm cartridge, citing superior performance in testing, but the German delegation objected and the standardization process was indefinitely halted.
context_section_description: The 5.7×28mm has a cartridge case capacity of 0.90 ml (13.85 grains H₂O).
  Americans define the shoulder angle at alpha/2 ≈ 35 degrees. The common rifling twist rate for this cartridge is 1:228.6 mm (1:9 in), 8 grooves, Ø lands = 5.53 mm, Ø grooves = 5.62 mm, land width = 1.63 mm and the recommended primer type is small rifle.
  According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings, the 5.7×28mm can handle up to 3,450 bar (345 MPa; 50,000 psi) Pmax (the nominal maximum) piezo pressure. In C.I.P. regulated countries, every rifle cartridge combination has to be proofed at 125% of this maximum C.I.P. pressure to be certified for sale to consumers, referred to as "PE". This means that 5.7×28mm chambered arms in C.I.P. regulated countries are currently (2018) proof tested at 4,313 bar (431.3 MPa; 62,550 psi) PE piezo pressure.
caption: The 5.7×28mm cartridge next to similarly-sized cartridges, from left to right: 4.6×30mm, 5.7×28mm, .30 Carbine
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