5.56 x 45mm United States
Details
| Type | Ball, MK 262 MOD 1 |
|---|---|
| Projectile | FMJ, Open Point, GM, 1 knurled crimping cannelure |
| Case | brass, taper crimp |
| Primer | percussion, flat, brass, ring crimp, red annulus |
| Headstamp | W C C 0 3 |
| Notes | This is a long-range loading with a 77-grain Sierra Matchking OTM projectile, manufacutred by Black Hills Ammunition. |