For convoys I line myself up ahead of the convoy at 90 degrees to the convoy course, turn my scope to till 0 gyro is indicated, then as the first row (abreast) of the convoy crosses my scope I fire. The furthest away will cross first etc. All torps should impact within a few seconds of each other giving insufficient time for the merchants' evasive turns to have sufficient effect.
Then it's time to avoid the escorts - but that's another story.
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