
            | Type | Ball, Extraction Test | 
|---|---|
| Projectile | FMJ, GMCS, 1 knurled crimping cannelure | 
| Case | steel, taper crimp | 
| Primer | percussion, flat, brass, ring crimp | 
| Headstamp | F A 7 3 | 
| Notes | Experimental - plain steel case, only 100 made for static extraction tests at Rock Island Arsenal (Rodman Lab). |