[KaleunMarco]

Originally Posted by Bubblehead1980

I had no idea they had limitations, thought were unlimited. I assume it is possible to give them historical limitations on number of DC?

from The Pacific War Online Encyclopedia
Japanese Depth Charges
Japanese depth charges were rather light, and in the early days of the war they were usually fused too shallow, allowing many American submarines to escape. The Japanese were apparently unaware that the more modern American subs could dive to 300 feet (90m) or more. Japanese escort commanders also had a tendency to assume a kill at the first sign of floating oil or debris. However, one of the stupidest men to ever darken the doors of the United States Congress revealed in a press conference that U.S. submarines were capable of diving deeper than the Japanese thought, and thereafter Japanese kills of U.S. submarines increased. The Congressman in question was politically powerful and was able to avoid any immediate consequences, but was convicted on an unrelated charge of accepting bribes after the war ended. (Andrew May - Dem. - 7th KY)

All Japanese depth charges had dimensions of 30.5" by 17.7" (77.5cm by 45cm). The Type 95 was standard at the time war broke out, with a 220 lb (100 kg) charge of Type 88 explosive (ammonium perchlorate and ferrosilicate). ... There were just two depth settings, 100 feet (30m) and 200 feet (60m), the latter well above the dive depth of American subs.
Later (in the war) the charge was increased to 324 lb (147kg) of Type 97 explosive (70% TNA/30% HNDA) and a 300 foot (90m) setting was introduced. Slow ships could drop the charge with a parachute to retard its sinking until the ship was clear, but this reduced the depth setting to a maximum of 100 feet (30m).

The Type 2, introduced later in the war, was similar to British depth charges, with 230 lbs (105kg) of Type 97 explosive and depth settings of 98 feet, 197 feet, 292 feet, 390 feet, and 480 feet (30m, 60m, 89m, 120m, and 145m). Later versions of the Type 2 had up to 357 lbs (162kg) of explosives. The Japanese experimented with a depth charge having 220 lbs (100 kg) of explosives and a magnetic influence fuse, but this weapon did not reached (sic) production before the surrender. The Japanese loaded depth charges on almost every ship that could carry them, and they made heavy use of depth charge throwers, even on merchant ships.
The typical loadout on a fleet destroyer was about 30 depth charges, while dedicated escort ships had a very large loadout, of as many as 300 depth charges.