From what I could gather…

It’s literally just a Czech version of 

Israeli M711 APFSDS since T-72M4CZ in an upgrade carried out with Israeli Cooperation.

It’s comparable to India’s 125mm Mk 2


Czechs Claim at least 

250mm @ 2000m at 60 °


My estimate based on 500mm WHA rod at

1650-1660m/s muzzle velocity 

gives it ~255mm @ 2000m at 60 °