British depth charges:
http://www.navweaps.com/Weapons/WAMBR_ASW.htm
Note the listing for the Mk VII Heavy:
Quote:
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The British claimed this DC would split a 0.875 inch (22 mm) hull at 20 feet (6.1 m) and force a submarine to surface at about twice that distance. A minol charge introduced in 1942 increased these distances to 26 feet (7.9 m) and 52 feet (15.8 m), respectively.
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American depth charges:
http://www.navweaps.com/Weapons/WAMUS_ASW.htm
One of the problems with all depth charges was that the depth settings came in stages; i.e. they could be set for 100 ft, 125 ft, 150 ft etc, but not for 135 or 160. Actually getting the charge to within 20-25 feet of the submarine was a real trick, which was one of the reasons hedgehogs became popular. Take a look at the chart for number of 'attacks' (weapons dropped) versus number of kills.
Depth-charging submarines was less effective per weapon fired than naval gunnery, and the overall hit rate for that was only about 7%.