
| Type | Spotter, XM157 |
|---|---|
| Projectile | FMJ, GM, 1 knurled crimping cannelure |
| Case | brass, taper crimp, 1 knurled (neck) cannelure |
| Primer | percussion, flat, aluminum, 3-stake crimp |
| Headstamp | [none] |
| Notes | This is probably an inert round, based on information from Paul Smith's "Variations of Military Experimental Calibers". |