| Answer | Crossword Clue |
|---|---|
| CALIBER | Gun bore. |
| REAMED | Widened a gun bore |
| CALIBER | Diameter of a gun bore |
| REAMED | Enlarged the bore (of a gun). |
| RIFLING | Spiral grooves in bore of a gun. |
| CALIBER | Diameter of the bore of a gun |
| CALIBRATE | Ascertain the diameter of, as a gun bore. |
