The 37mm KwK 36, the primary armament of both early panzer 3s in game, really struggles with penetration against enemy armor with it’s APHE only penetrating 47 mms of armor, meaning over range even stuarts can be largely invulnerable to your fire, and more heavily armored tanks like the T70 (which is the same BR) could care less about you shooting at them with how little you do. To have these tanks be more able to destroy enemies at similar battle ratings but stay reasonable, I propose splitting the current stores of APHE in around half and using the Pz.Gr 40 APCR round for that space in the Panzer 3 B (31 APHE/ 30 APCR) and panzer 3 E (33 APHE/ 33 APCR). The Pz.Gr 40 was a tungsten-cored APCR that is represented in War Thunder already, and has a penetration value of 86 mms, which would be a huge help to these tanks, but due to the lack of explosive filler, would still be completely fine as they are.
