[Geomax]

AP rounds were fired at 720 mps - plugging those numbers into my damage calculation spreadsheet gives 6dx260 pi++, or 6dx182 (2) pi++ converting to WW2 AP. It'll penetrate anything short of 7644 points of DR on average, or about 16 meters of reinforced concrete, which equates pretty well with it being able to penetrate 7 meters of concrete at max range.