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 °