The two CZs I have experience with, a 453 American and a 452 Varmint, would both do better than .5 with good ammo, i.e. Eley or RWS HPs or Aguila Rifle Match.
I like the looks and action of the 77/22, but so far mine falls a little short of that standard, but it's still early in the testing process. At .75 or so with hunting ammo, it's still okay for my use.
