Someplace reported that the modern Russian 125mm smoothbore can fire a missile that can penetrate 37 inches of steel.
I thought about that for a momemt. So at 6km a T-80 could possibly punch a hole through Yamato (assuming the missile didn't explode like it was suppose to inside the ship) by going though the first side's belt armor, through the ship, and out the other side's belt armor like the RPGs use to do the Navy PBR's in Vietnam.
Of course Yamato could in theory return the favore at upwards of 30km with 18.1 inch shells. Even the 6.1 inch shells would probably be enough from 10km away.
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