7 . 92×24mm The 7 . 92×24mm cartridge is a pistol cartridge designed in Belgium by Rik Van Bruaene of VBR - Belgium . The design objective was the development of a cartridge for use in Personal Defence Weapons ( PDW ) , and for use in pistols , submachine guns and carbines . The technical specifications of the 7 . 92×24mm round are much closer to the 9×19 mm NATO pistol round than that of the 4 . 6×30 mm and 5 . 7×28 mm rounds more commonly used in PDWs . The 7 . 92×24mm is specially designed to fulfill a multicaliber role in the existing 9×19mm and . 45 Auto frame platforms . Design objectives . The design objectives of the 7 . 92×24mm project were to create a new self - defence caliber with great stopping power in a pistol and sufficient dimensions for use in a PDW or carbine style rifle . The 7 . 92×24mm round exceeds the minimum FBI penetration requirements — 12 - inch penetration when fired into ballistic gelatin . The 7 . 92×24mm caliber is available on the civilian , law enforcement and military markets . The 7 . 92×24mm is shorter than the more ubiquitous 4 . 6×30mm and 5 . 7×28mm chamberings more commonly used in PDWs , this to allow usage in compact and sub - compact weapons . In order to be compatible with the 9×19mm and . 45 Auto frame platforms , the 7 . 92×24mm caliber case has a special selected length of 24mm and uses different bullet types for each frame platform to fit their different lengths of 29 . 6mm and 32 . 4mm . The round uses one standard case for both frame platforms and two series of bullets — the " S " cartridge is used to fit in the 9×19mm frame platforms whilst the " N " cartridge is used in the . 45 Auto frame platforms . 7 . 92×24mm case . To prevent ammunition supply problems caused by the launch of a new caliber , the 7 . 92×24mm caliber uses a straight case , which is based on a shortened . 30 Carbine case . These cases are widely available all over the world , and can be easy modified for the 7 . 92×24mm projectile . 7 . 92×24mm N cartridge dimensions . The 7 . 92×24mm N cartridge is intent for the use in the . 45 Auto frame platforms . The 7 . 92×24mm has 0 . 926 ml ( 14 . 26 grains ) HO cartridge case capacity . The common rifling twist rate for this cartridge is 254 mm ( 1 in 10 in ) , 6 grooves , Ø lands = 7 . 62 mm , Ø grooves = 7 . 82 mm and the primer type is small pistol . The 7 . 92×24mm N cartridge has a maximum length of 32 . 4 mm . According to the official C . I . P . ( Commission Internationale Permanente pour l ' Epreuve des Armes à Feu Portatives ) guidelines the 7 . 92×24mm case can handle up to 3200 Bar ( 46412 psi ) piezo pressure . In C . I . P . regulated countries , every rifle cartridge combo has to be proofed at 125 % of this maximum C . I . P . pressure to certify for sale to consumers . 7 . 92×24mm S cartridge dimensions . The 7 . 92×24mm S cartridge is intended for use in the 9×19mm frame platforms . The 7 . 92×24mm has 0 . 926 ml ( 14 . 26 grains ) HO cartridge case capacity . The common rifling twist rate for this cartridge is 254 mm ( 1 in 10 in ) , 6 grooves , Ø lands = 7 . 62 mm , Ø grooves = 7 . 82 mm and the primer type is small pistol . The 7 . 92×24mm S cartridge has a maximum length of 29 . 6 mm . Cartridge varieties . 7 . 92×24mm 3P The 7 . 92×24mm 3P cartridge contains three projectiles . It is fired from a smoothbore barrel equipped firearm . The impact of the three projectiles are comparable with the impact of three pellets of a 12 - gauge buckshot round . 7 . 92×24mm BAP ( Brass Armor Piercing ) This variety has different types of brass monoblock projectiles which have armor piercing capabilities at soft body armor level II and IIIA . Although Brass Armor Piercing bullets for military use are common , the use of Brass Armor Piercing bullet for law enforcement is very controversial - according to international agreements concerning law enforcement ammunition , it is prohibited for a police officer to use bullets which can penetrate their own bulletproof vest . The 7 . 92×24mm BAP cartridge is aimed at a police market where armor piercing bullets with a limited penetration are needed . Different types with different bullet weights exist . 7 . 92×24mm AP - HPF ( Armor Piercing - Hollow Point Fragmenting ) Most law enforcement agencies prefer a bullet with greater stopping power like a hollow point bullet , traditional armor piercing bullets have a comparably low stopping effect . The 7 . 92×24mm AP - HPF 5 . 7 uses a 5 . 7 mm hardened steel penetrator and a brass fragmenting hollow point sabot . The 5 . 7 hardened steel penetrator is able to defeat body armor and the fragmenting hollow point sabot increases the stopping power against unprotected targets . The objective of the 7 . 92×24mm AP - HPF 5 . 7 cartridge is to compete with the stopping power of the big . 45 JHP bullets and also with the drill performance of the small PDW calibers 4 . 6×30 mm and 5 . 7×28 mm . 7 . 92×24mm FRA ( Frangible ) cartridges The 7 . 92×24mm FRA ( Frangible ) bullets are designed to break - up at impact . They can be used for indoor shooting . 7 . 92×24mm cartridges for the military market . 7 . 92×24mm Armor Piercing The 7 . 92×24mm AP cartridges intended for the military market are based on a new patented bullet technology designed by Rik Van Bruaene . The military AP bullet contains a brass sabot and a hardened steel penetrator . This technology can be used in different calibers . Different dimensions of sabots and penetrators exist and many combinations of sabot weight and caliber are possible . Problems with the Geneva Conventions . To increase the stopping power of the 7 . 92mm AP bullets , some bullet types are provided with a penetrator / sabot combination , which separates by impact at a body of the opponent . This separation of the penetrator and sabot in the body of the opponent , causes a larger wound cavity and doubles the chance to hit a vital organ . This is similar to the 2 - part fragmenting bullets . Although there is much support for this increased lethality , some people consider this separation effect to be in breach of the Hague Conventions . The separation strength from the sabot and penetrator can be changed by adapting the sabot identities . Other penetrator / sabot combinations do not have a separation on impact with a human body . Weapons chambered . 7 . 92×24mm N 7 . 92×24mm S External links . Link to VBR - Belgium Link to VBR - Belgium 7 . 92x24 mm page