| Ordnance BL 16.25 inch gun Mk I | |
|---|---|
 | |
| Type | Naval gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1888 – 1909? |
| Used by | Royal Navy |
| Production history | |
| Manufacturer | Elswick Ordnance Company |
| No. built | 12 |
| Variants | no two guns were identical |
| Specifications | |
| Mass | 111 tons |
| Length | 43 ft 7 in; 13.3 m |
| Barrel length | 40 ft 8 in; 12.4 m bore (30 calibres) |
| Shell | 1,800 lb (820 kg) Armour-piercing, Common, or Shrapnel |
| Calibre | 16.25 in (413 mm) |
| Elevation | -5° – 13° |
| Rate of fire | about one round every three minutes |
| Muzzle velocity | 2,087 feet per second (636 m/s)[1] |
| Maximum firing range | 12,000 yards (11,000 m)[2] |
The Elswick BL 16.25 inch naval gun was an early British superheavy rifled breech-loading naval gun, commonly known as the 110-ton gun or 111-ton gun.