Penetration Drop-Off Question/Challenge

Einzelganger7: Fun fact, most of the 128mm German cannons (Pak/Kw.K/Kanone 44 L/55) have a penetration loss of only 5mm with AP, from 246mm at 50 meters to 241mm at 500 meters while the APCR is more significant by 48mm, from 311mm at 50 meters to 263mm at 500 meters.

Edit: as for a source to see the penetration values at long distances, so far only the game by watching one by one, unfortunately.