These guns have access to the same type of ammunition as the 130 mm seen in the Spokoinyy have with a new addition: HE, SAPBC, HE-VT* and HE-TF. Point blank defense, reliable long-range AAA, Swiss cheese maker of lightly armoured vessels, or just additional turrets to make minor damage to disable critical components and weapon systems of larger vessels. This systems offers a wide variety of purposes when it comes to all types of engagements. It is only surpassed by the Sverdlov as it has six turrets and not four. However, the Chapayev has four turrets of two cannons each, meaning the total RPM of the Chapayev's 100 mm cannons is close to ~120 RPM which is substantially higher than most high-calibre weapon systems seen in other vessels. It is nothing new that this weapon system has a very high ROF for its calibre (~30 RPM considering it is a two cannon mount), it has half of what cannons like the 100 mm/55 MLE model 53 have (~60 RPM). They have the exact same use as when used in the Spokoinyy, delivering large numbers of rounds to surface targets and can act as very powerful AAA.
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While these turrets are very similar to the 130 mm/58 SM-2-1, they do have a reduced performance due to the reduced calibre. The Chapayev is one of the two Soviet cruisers with access to 100 mm/70 SM-5-1 cannons. Ammunition racks, engine compartments, and any other critical components are to be targeted while using these rounds as the reduced filler will not cause as much damage. While using APCBC, aiming at critical components is crucial. While it has significantly reduced explosive filler compared to other rounds, it increases the combat capabilities of the Chapayev against heavily armoured cruisers. The APCBC round, an new addition compared to previous vessels, is an essential tool when fighting heavily armoured cruisers and battleships. The SAPBC round is a decent jack-of-all-trades when it comes to destroying enemy vessels, with decent explosive filler as well as increased penetration compared to the HE shell.
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While this round lacks penetration power, the explosive filler in it is more than enough to decimate lightly armoured vessels in seconds. They have a wide variety of different purpose ammunition, from solely anti-ship ammunition to long range anti-aircraft ammunition. It is nothing new to see potent weapons with devastating explosive power with a relatively quick firing rate. The Chapayev is one of the two Soviet cruisers with access to the formidable 152 mm/57 B-38.