27 x 143mm B United States
Details
| Type | Fired |
|---|---|
| Projectile | [none] |
| Case | steel, grey painted |
| Primer | percussion (fired), flat, brass, ring crimp |
| Headstamp | LOS M 1 71 |
| Notes | Experimental case for Mauser Mod B cannon (20mm) using a special barrel. The loaded round used shortened 27x145B cases with the projectile seated very deeply, as the cartridge OAL had to match a 20mm HS820 round. Cases and projectiles were sent to the US by Germany and loaded by Hercules. |