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The 100 mm (3.9 in) L/65 caliber Type 98 gun utilized a horizontal sliding breech, in addition to either monobloc (made from a single forging) or replaceable liner construction of the barrel. The gun featured a spring-powered rammer that was cocked by means of the recoil of the gun being fired; this allowed the rammer to load the gun at any elevation. 169 of the guns were completed, with 68 being land-based. Though this oft-quoted number may be outdated, as 116 guns went to ship based mounts, 12 for Taiho and 8 each on Oyodo and the 12 Akizuki-class. One shortcoming of the gun was that it had a service life of only 350-400 effective full charges, as a result of the high muzzle velocity.[1]

Mountings
These guns were used in twin gun turrets. The total weight of the mount and guns on Akizuki was 34,500 kg (76,100 lb). The mount installed on Akizuki could traverse at 12° to 16° per second and could elevate at a rate of 16° per second. It was electro-hydraulically powered and could be moved by hand in the event of an emergency.

Ammunition
The gun fired a 1,118 mm (44.0 in), 28 kg (62 lb), fixed, high-explosive round with a brass casing. Only nose-fused high-explosive ammunition was developed for the gun.

source:https://en.wikipedia.org/wiki/10cm/65Type98naval_gun
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