
 
            | Type | Inert, M172 | 
|---|---|
| Projectile | FMJ, GM, black, 1 knurled crimping cannelure | 
| Case | brass, taper crimp, black stained, 1 knurled (neck) cannelure | 
| Primer | blind | 
| Headstamp | ⊕ LC 66 | 
| Notes | Most of the original black case/projectile chemical blackening has worn off. |