Vastly over-performing effectiveness of armor
current Iron Plate armor uses the US 1945 class B armor as a standard for quality 1 armor this means that 10 inches armor is 10 inches of effective armor (1 inch of us 1945 B steel is essentially 1 inch of RHA armor aka rolled homogeneous armor which is used as the standard for 1 inch thickness to 1 inch effectiveness)
in reality Iron Plate had an effective thickness modifier of 0.5 to 0.55 so 1 inch of Iron plate armor would be 0.5 inches of effective thickness this meant a 10 inch iron pl
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Having spoken to the OP about this issue, I think I can help clarify the issue the OP is trying to point out.
The Issue:
Currently, the in-game penetration value of guns seems to be based off real life data (with the range fall-off issue seems to be addressed in the upcoming patch).
For example, the in game 12" Mark 2 gun have a 1000m pen value of 15.3", this closely match the British 12"/45 Mark X gun used on Dreadnought, which have point blank penetration of 16" against KC armo
