6 inch 35 caliber naval gun 1877

6 inch 35 caliber naval gun 1877
Russian 6 inch 35 caliber naval gun in Suomenlinna
Type	Naval and coastal gun
Place of origin	Russian Empire
Service history
In service	1885-1917 Russian Empire 1917-1944 Finland
Used by	Russian Empire Finland
Wars	Russo-Japanese War First World War Second World War
Production history
Designer	A. F. Brink
Designed	1882
Manufacturer	Obukhov State Plant
Variants	Hoop gun 1885 Wire-wound barrel 1887 New wire-wound barrel 1892
Specifications
Weight	8,500 kg (18,700 lb)
Barrel length	5,349 mm (17 ft 7 in)
Caliber	152.4 mm (6 in)
Breech	Interrupted screw
Carriage	Vavasseur mount Dubrov mount Krel casemate mount
Elevation	Vavasseur mount: -7° to +20° Dubrov mount: -5° to +15° Krel mount: -4° to +12°
Traverse	Vavasseur mount: 360°
Rate of fire	Theoretical: 4-5 rpm Practical: 1 rpm
Muzzle velocity	600–700 m/s (2,000–2,300 ft/s) depending on ammunition
Maximum firing range	15 km (9.3 mi)

6 inch 35 caliber naval gun 1877 was a 152 mm naval gun used by Russian Empire. The gun was used from 1887 as battleship secondary armament and cruiser armament. The gun was mostly replaced by newer 6 inch 45 caliber Canet gun 1892 by Russo-Japanese War, but was still used on some ships. During the First World War fourteen guns were used as a coastal guns on Gulf of Finland in the Peter the Great's Naval Fortress and were taken over by Finland after Finland's Declaration of Independence in 1917. The guns were used by Finland in the Second World War. Russian model year 1877 refers to rifling system, not gun adoption.

Russian Empire Staff captain A.F. Brink had developed plans for a new six inch 35 caliber gun that was able to withstand 20% higher barrel pressures than existing guns. In 1882 development began for a new six inch naval gun that resulted in Brink's design being selected. Based on gun barrel material strength theories of lieutenant general N.V. Kalakutskij Obukhov State Plant produced the first 35 caliber gun in 1885. The design was a hoop gun with a total of eight layers besides the inner barrel: five mantle barrels, shroud, connecting and mounting rings. The gun was the first medium caliber gun used by Russia that had Treuille de Beaulieu screw breech block with de Bange obturator.