You owe it to your CZ to try some really good bullets just to see if it shoots them even better.
I have tried FMJ 55s in my CZ and it shoots them OK but nowhere near the same level as 52 grain Bergers or 52 grain SMKs or 55 grain Bergers.
The CZ also shoots Nosler Ballistic Tip 40 grains really well.
The CZ just barely is able to shoot .5 inch groups and averages just over that with the best load with Sierra FMJs. I save the Dogtown bullets for my AR with the short barrel. It can't break 1 MOA even on a good day with good bullets anyway.