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Originally Posted by chilly
:hmm: And what max depth for jap's depthcharges???
As i know max depth for british and usa was 150m in real world..... 
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It was worse than that:
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98 or 197 feet (30 or 60 m)
Later versions included a 295 foot (90 m) setting
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http://www.navweaps.com/Weapons/WAMJAP_ASW.htm
The reason they were effective was because the Americans didn't know they were only good to 60 meters. Keeping a sub down is just as useful as killing it, if it can't surface and outrun the convoy.
As for the British and Americans, they too only went to 90 meters; but, as was stated earlier, a submarine doesn't start at that depth, it starts at periscope depth, or on the surface. The idea is to catch the sub before it gets deeper than the charges can go.
http://www.navweaps.com/Weapons/WAMBR_ASW.htm
http://www.navweaps.com/Weapons/WAMUS_ASW.htm