It's possible the Wiki author mistook postwar development for wartime DCs. Note the postwar British Mk X** was good for 1500 feet and the US Mk 16 was designed for 2500 feet.
Also remember the line from Das Boot about being certified to 90 meters, and note where the red line is on your depth guage. The fact that u-boats could reach more than 600 feet safely, and sometimes a lot more than that, and that US fleet boats also sometimes went well below 600 feet, it wasn't something that a captain really wanted to risk on a regular basis. Five hundred feet for a depth charge was probably plenty, especially since it could take a submarine quite awhile to get deeper than that.
I own a copy of Campbell, but I can't double check the figures since it's currently living in a storage unit, and digging it out could take hours.
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