20 x 102mm United States
Details
| Type | TP, T199 |
|---|---|
| Projectile | steel, aluminum windscreen, black, 1 copper driving band Projectile Markings: (white ink) 20MM- TP T199 K.O.P. Driving Band Markings: GMI-2-25-54-20MM-T283E1 |
| Case | brass, knurled choke crimp |
| Primer | electric, flat, brass, ring crimp, red annulus |
| Headstamp | [none] |