[MarkSheppard]

The Japanese developed a AP round for the Type 99; it was according to the 3rd Guards Division's adjustment material "Chart of Material Efficiency of Current Anti-tank Weapons" (「現有対戦車兵器資材効力概見表」) to penetrate 120mm of armor at 500m, which is close/similar to the early 88mm Flak rounds that the Germans used.

BTW; if you google that phrase (「現有対戦車兵器資材効力概見表」) , you turn up some interesting japanese language pages.