20 x 110mm RB Unknown
Details
| Type | BL&P |
|---|---|
| Projectile | steel, blue, 1 copper driving band Projectile Markings: (black ink) BL-P 1 |
| Case | brass, choke crimp, 1 hole |
| Primer | percussion (fired), flat, brass, ring crimp, purple annulus |
| Headstamp | 20MM 3-68 |