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Жаль что тема заглохла

А я так ответов и не нешол
Нет, есть кое-что по глубинкам: http://www.uboat.net/allies/aircraft/raf_coastal.htm
During the spring of 1940 experiments were carried out to see if an aircraft could successfully drop a depth charge (A Royal Navy model little changed from WWI). This was proven feasible if the aircraft was not too high or travelling too fast. Thus the MK. VII depth charge became the new weapon for Coastal Command's aircraft. These were later replaced by Torpex-filled depth charges with more explosive power.
А зону поражения никто не мерял наверное, только расчеты. Да и ВВ менялось.