105×617mmR

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 84 mm calibre Ordnance QF 20-pounder 84 × 618R cartridge as part of the development of the L7 105 mm rifled gun.

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%

105 mm guns using 105x617mm ammunition

 * L7-series (🇬🇧 United Kingdom)
 * M68-series (🇺🇸 United States)
 * M35 (🇺🇸 United States)
 * CN 105 F1 (🇫🇷 France)
 * CN 105 G2 (🇫🇷 France)
 * 10,5 cm Pz Kan 61 (🇨🇭 Switzerland)
 * L74 (🇸🇪 Sweden)
 * Rh 105-series (🇩🇪 Germany)
 * OTO 105 Low Recoil Force Gun (🇮🇹 Italy)
 * Cockerill 105HP (🇧🇪 Belgium)
 * GT 3 (🇿🇦 South Africa)
 * GT 7 (🇿🇦 South Africa)
 * GT 8 (🇿🇦 South Africa)
 * FRT L51 (🇦🇷 Argentina)
 * Type 94 (🇨🇳 China)
 * Type 15 (🇨🇳 China)
 * IWS (🇬🇧 United Kingdom)