[2] In 1941 it was estimated that there were 196 guns (82 in the Baltic, 70 in the Pacific, 37 in the Black sea and 7 in the Northern fleet) still in use as coastal artillery.

[1] In practice the rate of fire of 10 rpm was hard to achieve due to difficulties with ammunition handling.

In 1901 the fixed ammunition was changed to separate loading QF cased charge and projectile.

[3][4] When Finland became independent in 1917, the northern half of the coastal fortifications belonging to the Imperial Russian Peter the Great's Naval Fortress system protecting St. Petersburg fell in to Finnish hands mostly intact.

[6]: 145–151 Finnish coastal artillery staff made modifications to the gun mountings during the interwar period.

[7] During the Winter War coastal batteries equipped with the gun defended against Soviet Navy attacks before the sea froze over.

The guns also provided important artillery support for the Finnish army: at both ends of the Mannerheim line there were coastal batteries equipped with 152/45 C guns, and their role was important given the Finnish lack of field artillery.

In the Continuation War the 152/45 C was involved in the fighting again and several guns were lost to barrel explosions or were simply worn out.

The guns, designed originally before aircraft had been invented, were not especially effective in this role even after the modifications that had been made.

The battery was disbanded and the guns removed from the railway carriages after the war, but the plans for re-forming it remained in place.

[6]: 184–185 [10] After the Continuation War ended with the Moscow Armistice, the Allied Control Commission demanded that all coastal guns larger than 120 mm in calibre east of Porkkala had to be removed and placed in storage.

An investigation of the barrel failures concluded that the guns could not withstand the pressures created by the gunpowder used.

This led to a development of a new light weight high explosive shell which could be fired by a half-charge of gunpowder.

The cupola was built of thin metal and provided only very limited armour protection against small shrapnel.

Smaller changes to the gun mounting were also made, including replacing the recoil springs.