The stadiometer is one ugly SOB. It's quite hard to get a good result with it. I don't trust it at all.
When targeting manually - in cases like this when you've got time. Don't bother to find out the range. Just concentrate on AOB and speed. Set the range to 300m in the TDC. And turn your periscope so that the gyroangle points to a straight run. Then fire when he ship crosses your aim. If you've done your AOB and speed estimates ok, the torpedo will hit at bearing 0, no matter the range.
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