Regarding a manual this special shell was made for the eastern front.
A tank alone was lost - so the russians placed a platoon on every tank.
This HL shell didnt only stop the tank but sweeps of the infantry off, too.
Beneath the armour piercing ability a hail of fragments and a blast was produced at the impact. A special purpose shell to stop the tank riding russians.
Interesting, thanks. I read in the book “KV-1, KV-2 heavy tanks” by S Zaloga than the first use of this was in the short Kwk 37 75mm L24 gun and was introduced by may 1942. I have no data of the penetration however.