.24 Dardick Tround Tri-Bore United States
Details
| Type | Ball |
|---|---|
| Projectile | Spitzer, ceramic, white |
| Case | [none] |
| Primer | |
| Headstamp | [none] |
| Notes | This was intended for hard rock drilling. A device at the drill head would fire a tround cartridge with three of these projectiles, and the projectiles would break up the rock. The ceramic projectiles would also shatter, whereas stell projectiles would not and would thus damage the drill bit. |