The 105×617mm (4.1 inch), also known as 105×617mmR, is a common, NATO-standard, tank gun cartridge used in 105 mm guns such as those derived from the Royal Ordnance L7.
The 105×617mmR cartridge was originally developed from the calibre Ordnance QF 20-pounder 84 × 618R cartridge as part of the development of the L7 105 mm rifled gun.
Ammunition
Armour-piercing discarding sabot (APDS) +DesignationOriginYearPenetrator materialPropellant type & weightChamber pressureMuzzle velocityVelocity dropSub-projectile weight without sabot / with sabotPerforation at normal and oblique incidencesNotesL221950sTungsten carbideL28A11959Tungsten carbide (core) and Tungsten alloy cap 5.598 kg of NQ/M 044310 MPa1478 m/s93 m/s (at 1000 m) 185 m/s (at 2000 m)4.1 kg / 5.84 kg120 mm at 60° at 914 mProduced under licence by Germany as DM13, used in the Swedish Army as 60 mm Slpprj m/61 and in the Swiss Army as 10,5 Pz Kan 60/61 Pz Ke G Lsp.L36A1 / M3921959Tungsten carbide (core) and tungsten alloy cap 5.598 kg of NQ/M 044310 MPa1478 m/s93 m/s (at 1000 m) 185 m/s (at 2000 m)4.1 kg / 5.84 kg120 mm at 60° at 914 mBritish designation of the M392 APDS manufactured in the UK for the US Army, it features a safer primer. Quickly replaced in US service by M392A1M392A1 1960 Tungsten carbide (core) and tungsten alloy cap 5.598 kg of NQ/M 0441478 m/s91 m/s (at 1000 m) 181 m/s (at 2000 m)4.04 kg / NA127 mm at 60° at 4609 ft/s or ~820 mUS manufactured version of L36A1/M392. Manufactured to tighter tolerances for improved accuracy, and to correct an issue of in barrel breakup.M392A21964Tungsten carbide (core) and tungsten alloy cap 5.598 kg of NQ/M 0441478 m/s91 m/s (at 1000 m) 181 m/s (at 2000 m)4.04 kg / NA127 mm at 60° at 4609 ft/s or ~820 mIncorporates the anti-friction ring from L28A1B1. Slpprj m/621962Tungsten carbide (core)6.0 kg NK1096310 MPa1450 m/s4.5 kg / 6.32 kg200 mm at 30° obliquity at 1500 m, 140 mm at 55° at 700 mSwedish-developed APDS round with a 57 mm sub-caliber projectileL521965 or 19661968 (L52A2)Tungsten alloy (core) and Tungsten alloy (tilt cap)5.598 kg of NQ/M 0475.6 kg of NQ/M12 (L52A3)310 MPa1427 m/s80 m/s (at 1000 m) 158 m/s (at 2000 m)4.65 kg / 6.48 kg120 mm at 60° obliquity at 1830 m280 mm and 254 mm at 0° obliquity at 1000 m and 1500 m respectivelyThe L52 introduced an anti-ricochet tilt cap. Produced under licence by US as M728 and used in the Swedish Army as 61 mm Slpprj m/66
Armour-piercing fin-stabilized discarding sabot (APFSDS) There are different ways to measure penetration value. NATO uses a criterion that 50% of the shell has to go through the plate, while the Soviet/Russian standard is higher as 80% had to go through. According to authorities like Paul Lakowski, the difference in performance can reach as much as 8%Pokonać pancerz! Część III – dane amunicji APFSDS-T