What possible difference would the range make? The explosive impact of the torpedo is the same, whether it hits from 400 yards out or 40,000.
I did sink the Hiryu once with two hits (out of 3, my last that patrol - one missed astern). It took her quite awhile to do down (over 90 minutes), but she did slowly settle lower and lower, and then went down stern first. I was using NSM classic, not stock hit points though.
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