If a "Y" is Yamato, those are 60k each, 3 would be 180k, you'd need to sink 6 of the beasties to equal 300k. Not that good at math but with an average of 12 fish per Yamato you'd need more fish than a GATO carries, so the "no refit" rule would be a problem. 30 of the 10,000 ton tankers would be a problem too since they require an average of 2 fish each, don't think any fleet boat has 60 torpedoes.
I've done 400k on some patrols using refit several times, main problem I found with that is corrupted or sloooooooooow loading savegames - if I sink 30-50 ships on a single patrol the savegame files gets up to a ridiculous number of megabytes and takes forever to load. For that reason I restrict myself to two refits per patrol these days, then it's time for R&R (Rum & Raucousness) to let someone else fight the war for a while.
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