According to tests, the MK8MOD6 can penetrate 439mm armor at a 35-degree Angle over a distance of 17km, but in the game, it takes up to 9km to complete.
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15km penetration at 30 degrees for Mk8: 528.8mm of armor penetrated.
458 /cos 30 = 528.8mm.
That seems significantly higher than 439 2 more km out at 5 more degrees out.
The performance of APCBC in the game will decline rapidly after exceeding 30 degrees. You can find a 439mm plane, such as the turret seat ring in IOWA. Conduct various analyses on it.
The most significant impact it will cause is that, according to the formula, the MK7 has the opportunity to penetrate the main armor of Yamato and Sovetsky Soyuuz at a distance of 14km. However, in the game, it might not be possible to break through until within 6.5km.