What ammo does the auxiliary guns in Naval use (like the 100mm on the Kronshtadt), do they fire AP, HE, HE-VT?

I tried searching everywhere and couldn’t find the answer to this. Normally you can choose which ammo most secondary weapons will fire, but for ships with tertiary cannons you are unable to, and there seems to be know way of knowing what ammo types they fire, or whether they switch ammo types based on the target they are firing at

Like for example the 100mm guns on the Kronshtadt, or the 120mm guns on the Rodney. What ammo types do they fire and is there a way of knowing the stats of the shells they fire?