| Type | HEI (Inert), M56 |
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| Projectile | steel, steel fuze, olive drab, red band, 1 copper driving band Projectile Markings: (black ink) 20MM HEI INERT KOP-??? Driving Band Markings: *HVM-10-14 54 20MM T282E1* |
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| Case | brass, knurled choke crimp |
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| Primer | electric, flat, brass, ring crimp |
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| Headstamp | [none] |
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| Notes | This is a completely inert loading, with an inert projectile and an inert propellant substitute. Based on the corrosion at the base of the cartridge, as well as similar corrosion on other known specimens, the case is likely loaded with some type of salt. |
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