HK 4.6×30mm

The 4.6×30mm cartridge was introduced in 1999 as a competitor to FN Herstal's 5.7×28mm cartridge. Heckler & Koch started the development of a semi-automatic handgun for their 4.6×30mm PDW cartridge, the Universal Combat Pistol (UCP), but canceled it at the prototype stage. ==Overview==

Compared to standard intermediate cartridges, one can carry more 4.6×30mm ammunition due to the cartridge's lower weight and relatively small dimensions. Also, due to the lower weight of the bullet, aiming in rapid fire is much easier as recoil depends much on the weight of the bullet. CRISAT testing shows that because of the round's smaller diameter and high projectile velocity, body armor penetration is higher than that of traditional handgun projectiles. A series of tests performed by NATO in the United Kingdom and France indicated that 5.7×28mm was a superior cartridge. though both cartridges would ultimately be standardized by NATO with STANAG 4509 for 5.7×28mm and STANAG 4820 for 4.6×30mm respectively. A 2004 HK presentation claims that 4.6×30mm Combat Steel retains more energy after CRISAT-penetration than 5.7×28mm SS190 (2 g). ==Cartridge dimensions==

The 4.6×30mm has 0.87 mL (13.4 grains) H2O cartridge case capacity. 4.6×30mm maximum C.I.P. cartridge dimensions; all sizes in millimeters (mm). Americans define the shoulder angle at alpha/2 ≈ 22 degrees. The common rifling twist rate for this cartridge is 160 mm (1 in 6.3 in), 6 grooves, Ø lands = 4.52 mm, Ø grooves = 4.65 mm, land width = 1.21 mm and the 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 4.6×30mm can handle up to 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 4.6×30mm chambered arms in C.I.P. regulated countries are currently (2018) proof tested at PE piezo pressure. Despite the relatively high Pmax the bolt thrust of the 4.6×30mm is on a similar level when compared with traditional service sidearm cartridges. ==Cartridge types==

The 4.6×30mm ammunition is produced by RUAG Ammotec, Fiocchi, and BAE Systems. German Army cartridges ; DM11 "Ultimate Combat" (2.0 g AP steel projectile) : The DM11 cartridge weighs 6.5 g and uses a 2-g copper-plated steel bullet projectile at muzzle velocity. The DM11 Penetrator cartridge is designed for the MP7. The Ultimate Combat can penetrate the NATO CRISAT target at more than 200 meters. This ammunition combines energy transfer in soft targets and very good penetration. The muzzle velocity V0 and V100 indicate a G1 ballistic coefficient of approximately 0.141 to 0.150 (BCs are somewhat debatable) making the DM11 projectile aerodynamically more efficient compared to typical service handgun projectiles, but less efficient compared to typical assault rifle projectiles. At the stated effective range of 200 m, the DM11 projectile will be traveling at approximately Mach 1.25 (425 m/s) under International Standard Atmosphere (ISA) conditions at sea level (air density ρ = 1.225 kg/m3). Made by RUAG. : A 2004 Heckler and Koch slideshow claims a 300 m range for CRISAT penetration for the "Ultimate Combat". This early version was made by Radway Green of UK. ; DM18 (Blank) : Blank cartridge weighing 4.5 g. Available through RUAG/RWS. ; DM21 (2.6 g FMJ) : Tombac-plated steel jacket, lead core. Projectile weighs 2.6 g, cartridge weighs 6.9 g. Available through RUAG/RWS. Is made by MEN – Metallwerk Elisenhütte. Other RUAG cartridges ; Action SX (2.0 g DEA) : Controlled-deformation copper-alloy (lead-free) bullet weighing 2.0 g. Cartridge weighs 6.3 g. Website data identical to DM41 DEA. : Older version: The Action 4.6×30mm Law Enforcement cartridge weighs 6.5 g and is loaded with a 2 g CuZn-alloy (brass) solid hollow point projectile that achieves 700 m/s (2,300 ft/s) muzzle velocity. The cartridge is designed for the MP7. This ammunition is optimized for energy transfer in soft targets and to offer decent penetration performance on hard and combined targets like car doors or glass and body armor. :*Temperature range: -30 °C to +52 °C :*Velocity, energy at 0 m: 700 m/s, 480 joules :*Velocity, energy at 50 m: 568 m/s, 322 joules :*Ballistic coefficient C 1: 0.112-0.119 (ICAO)/(Army Metro) :*Mean chamber pressure: max. 400 MPa :*Penetration in 20% gelatine: bare at 25 m: < 30 cm :*Accuracy at 50 m: Ø 5 cm :*Effective service range: ; FMJ SX (2.6 g FMJ) : Tombac-plated steel jacket, lead core. Cartridge weight 6.9 g. : Possibly the same as DM31, as the same reference term is used in an old version of its datasheet. : Older version: The ball 4.6×30mm cartridge weighs 7 g and is loaded with a 2.6 g full metal jacket projectile with a PbSb-alloy core and a copper-plated steel jacket that achieves 600 m/s (2,000 ft/s) muzzle velocity. The cartridge is designed for the MP7. This ammunition is optimized for energy transfer in soft targets and offers good precision. :*Temperature range: between -54 °C and +52 °C :*Velocity, energy at 0 m: 600 m/s, 486 Joules :*Velocity, energy at 100 m: 463 m/s, 320 Joules :*Ballistic coefficient C 1: 0.171-0.187 (ICAO)/(Army Metro) :*Mean chamber pressure: max. 400 MPa :*Penetration in gelatine bare at 25 m: < 35 cm :*Accuracy at 100 m: Ø 8 cm :*Effective range:~ (HK claims that the FMJ round has more retained energy than the "Combat Steel" due to the FMJ's heavier projectile.) Types not described here are: • SEMI FRANGIBLE SX (1.7 g partial tombac-steel jacket, copper core) • AP SX (2.0 g solid steel core, Cu-coated, blackened) – possibly the same as DM31, as the same reference term is used in an old version of its datasheet • SUBSONIC SX (5.0 g tungsten alloy core, Cu-plated, blackened) – HK claims that an early version can penetrate the CRISAT target at 90 m. ==Platforms==