High explosive incendiary operational cartridge equivalent to M56A3.
Suitable for use in M39 and M61 cannons.
| Normative reference | MIL-C-46578D |
| Projectile type | High Explosive Incendiary |
| Projectile weight | 100.5 g / 1551 gr |
| Velocity at 7.5 m | 1000 m/s 3281 ft/s |
| Energy at 7.5 m | 50250 J |
| Case | Brass |
| Watertightness | Yes |
| Service temperature | 54°C to +21°C |
| -65°F to 125°F |