I never shipped more than 15kgs from Japan, but I rememer that it isn't possible to ship any package from a post office (which offers transport by ship, "surface air lifted" SAL, or by plane) if it weights more than 60kgs.
Extra heavy loads can be sent only through particular post offices.
If you have particular needs, you could always send your items using an international carrier like FedEx or UPS. They're very expensive, but there is -virtually- no weight limit.
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I suggest staying within a weight category,
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When I last sent a package from Japan to Europe, there were no weight categories. There was a certain price for every kilo, which is really better.
I sent 11kgs with SAL and it costed me around 10000yen, so the average is 1000yen per kilogram.