Use unknown. Weight of 21 tons 11 cwt 1 qtr. Fired a 380 lbs. (172.4 kg) solid shot at 2,035 fps (620 mps). Overall length 282 in (716.3 cm), bore 308.55 in (783.7 cm) [28.2 calibers]. Chamber 6,000 in³ (98,322 cm³).

Use unknown. Weight of 20 tons 19 cwt 3 qtr. 2 lbs. Fired a 450 lbs. (204.1 kg) solid shot at 2,022 fps (616 mps). Overall length 324.3 in (883.5 cm). Chamber 5.700 in³ (93,406.26 cm³).

Use unknown. Weight of 23 tons 12 cwt 18 lbs. Fired a 400 lbs. (181.4 kg) solid shot at 2,089 fps (637 mps) using a 190 lbs. (86.2 kg). Overall length 324.3 in (823.7 cm). Chamber 7,040 in³ (115,364.9 cm³).

Probably used on the Brazilian battleship Deodoro (1898). Weight of 26 tons 9 cwt. Fired a 352 lbs. (159.7 kg) shells at 2,500 fps (762 mps) using a charge of 67.5 lbs. (30.6 kg) Cordite or 135 lbs. (61.2 kg) of brown prismatic powder. Overall length 395 in (1,000.3 cm), bore 378 in (960.1 cm), Chamber 5,255 in³ (86,114.02 cm³). Shells were AP, CIAP, FS Common, CI Common and Steel Shrapnel, all of the same weight.

Designed for the Norwegian Coastal Defense ships Bjoergvin and Nidaros. When those ships were taken over by the British the guns were relined down to 9.2" (23.4 cm) and the ships were renamed renamed HMS Glatton and HMS Gorgon. See Britain 9.2"/51 Mark XII for details.

Two guns built for the Chilean protected cruiser Esmeralda which was sold to Japan and renamed Izumi. Weighed 24 tons and fired a 450 lbs. (204.1 kg) shot with either a 230 lbs. (104.3 kg) charge of pebble powder for an MV of 2,060 fps (628 mps) or a 85 lbs. (38.6 kg) charge of Cordite for an MV of 2,050 fps (625 mps).

Two guns built for the Italian protected cruiser Giovanni Bausan. No details available but probably similar to the previous Pattern F.

Became the Britain 10"/32 (25.4 cm) Mark I.

Became the Britain 10"/32 (25.4 cm) Mark II.

Use unknown. Plan dated 10 July 1886 with 7 guns ordered. Fired a 450 lbs. (204.1 kg) chilled iron shot or a 400 lbs. (181.4 kg) common shell with a 200 lbs. (90.7 kg) charge. Weight was 24 tons 5 lbs. Overall length was 342.2 in (869.2 cm) and bore was 320 in (812.8 cm) [32 calibers].

Nomenclature Note: "Naval Weapons of World War One" describes this gun as 26 calibers, but the bore length given in this source as shown above is 32 calibers.

Use unknown. Fired a 450 lbs. (204.1 kg) shot with an MV of 2,142 fps (652.9 mps) with a black powder charge of 255 lbs. (115.7 kg). Weight was 30 tons 10 cwt 3 qtr. Overall length was 340 in in (863.6 cm) and bore was 322 in (817.9 cm).

Used for the Italian battleships of the Ammiraglio di Saint Bon class and armored cruiser of the Giuseppe Garibaldi class. See Italy 254 mm/40 (10") A 1899.

Used for the Argentine cruisers of the General Belgrano class. See Argentina 10"/40 (25.4 cm) EOC Pattern PI.

Two guns built, use unknown. Fired either a 450 lbs. (204.1 kg) shell with an MV of 2,440 fps (744 mps) or a 500 lbs. (226.8 kg) shell with an MV of 2,300 fps (204.1 mps), both with a charge of 83 lbs. (37.6 kg) Cordite 0.5. Weight was 32 tons 14 cwt.

Used for the Japanese armored cruiser Kasuga. See Japan 10"/40 (25.4 cm) EOC Pattern R.

Designed for the Chilean Coastal Defense ship Constitution which was taken over by the British and renamed HMS Swiftsure. See Britain 10"/45 (25.4 cm) Mark VI.

Designed for the Japanese Battleships of the Saatsuma and Katori classes. See Japan 10"/45 (25.4 cm) Armstrong/EOC Pattern T.

Designed for the Italian armored cruisers of the San Giorgio class. See Italy 254 mm/45 A (Armstrong/EOC) 1908.

Designed for the Chilean Coastal Defense ship Libertad which was taken over by the British and renamed HMS Triumph. See Britain 10"/45 (25.4 cm) Mark VII.

Designed for the Japanese Battleships of the Saatsuma and Katori classes. See Japan 10"/45 (25.4 cm) Vickers Mark B.

Designed for the Russian armored cruiser Rurik (II). See Russia 10"/50 (25.4 cm) Pattern 1908.

Designed for the Italian armored cruisers of the Pisa class. See Italy 254 mm/45 V (Vickers) 1906.

Designed for the Japanese Navy, was not built in Britain. Vickers plan dated 27 March 1908 had the notation that the name "Vickers" should not appear on the guns. Plan was sent to the Japanese on the day it was completed. May have been used to develop the Japan 10"/45 (25.4 cm) 41st Year Type guns built in Japan. Overall length 450.04 in (1,143.1 cm), bore 437.535 in (1,111.3 cm).