| 7.5×55mm GP 11 |
|---|
Two 7×57 cartridges (left) next to a 7.5×55mm / GP 11 (mid), .308 Win (right), and .223 Rem (far right) |
| Type | Rifle |
|---|
| Place of origin | Switzerland |
|---|
|
| In service | 1911–present |
|---|
| Used by | Switzerland, Israel |
|---|
| Wars | World War I (Armed neutrality), World War II (Armed neutrality), 1948 Arab–Israeli War |
|---|
|
| Designed | 1911 |
|---|
| Produced | 1911–present |
|---|
| Variants | Gewehrpatrone 1890, Gewehrpatrone 1890/03, GP 90/23, GP 11 |
|---|
|
| Case type | Rimless, bottleneck |
|---|
| Bullet diameter | 7.78 mm (0.306 in) |
|---|
| Land diameter | 7.51 mm (0.296 in) |
|---|
| Neck diameter | 8.58 mm (0.338 in) |
|---|
| Shoulder diameter | 11.63 mm (0.458 in) |
|---|
| Base diameter | 12.64 mm (0.498 in) |
|---|
| Rim diameter | 12.65 mm (0.498 in) |
|---|
| Rim thickness | 1.65 mm (0.065 in) |
|---|
| Case length | 55.60 mm (2.189 in) |
|---|
| Overall length | 77.70 mm (3.059 in) |
|---|
| Case capacity | 4.22 cm3 (65.1 gr H2O) |
|---|
| Rifling twist | 270 mm (1 in 10.63 in) |
|---|
| Primer type | Berdan or boxer large rifle |
|---|
| Maximum pressure | 380 MPa (55,000 psi) |
|---|
|
|
|
| Bullet mass/type |
Velocity |
Energy |
| 130 gr (8.4 g) SP |
3,000 ft/s (910 m/s) |
2,608 ft⋅lbf (3,536 J) |
| 150 gr (9.7 g) SP |
2,820 ft/s (860 m/s) |
2,658 ft⋅lbf (3,604 J) |
| 174 gr (11.3 g) GP 11 |
2,560 ft/s (780 m/s) |
2,535 ft⋅lbf (3,437 J) |
| 180 gr (11.7 g) SP |
2,570 ft/s (780 m/s) |
2,642 ft⋅lbf (3,582 J) |
| 200 gr (13.0 g) SP |
2,460 ft/s (750 m/s) |
2,700 ft⋅lbf (3,700 J) |
|
| Source(s): https://bobp.cip-bobp.org/uploads/tdcc/tab-i/7-5-x-55-suisse-en.pdf |
The 7.5×55mm Swiss or 7,5mm GP 11 (or unofficially 7.5×55mm Schmidt–Rubin) is a cartridge developed for the Swiss Army. It originated from the Gewehrpatrone 1890 (7.5×53.5mm) developed in 1889 by mechanical engineer Lt. Col. Eduard Rubin for rifles based on Rudolf Schmidt's action design. The 7.5×55mm Swiss GP 11 cartridge is similar in appearance to the slightly smaller 7.5×54mm French round though the two are not interchangeable.
