105×617mmR
The 105×617mm (4.1 inch), also known as 105×617mmR, is a common, NATO-standard, tank gun cartridge used in 105mm guns such as those derived from the Royal Ordnance L7.
| 105×617R | |
|---|---|
A 105 mm DM16 illuminating round alongside a 105 mm DM23 APFSDS round (cross-sectioned). | |
| Type | Tank gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1959–present |
| Used by | Western Bloc and others |
| Production history | |
| Designer | RARDE Fort Halstead |
| Designed | 1950s |
| Specifications | |
| Case type | Rimmed, bottleneck |
| Bullet diameter | 105 mm (4.1 in) |
| Shoulder diameter | 129 mm (5.1 in) |
| Base diameter | 137 mm (5.4 in) |
| Rim diameter | 147 mm (5.8 in) |
| Case length | 607–617 mm (23.9–24.3 in) |
The 105×617mmR cartridge was originally developed from the 84 mm (3.3 in) calibre Ordnance QF 20-pounder 84 × 618R cartridge as part of the development of the L7 105 mm rifled gun.
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