All CZ pistols are designed and tested around the ammo they can get in Europe, which is strictly FMJ. My understanding is that all testing is done with S&B 115 and 124gr FMJ... the same stuff you can buy here in the states. The only ammo ever reported on this board to give CZs feeding issues is the sharply-angled conical ogive, and then only sporadically. The conclusion is, if you want SD ammo that feeds flawlessly, then stick with the curved ogive ammo, like the Federal HS series and Speer GoldDots.
> I've never needed to polish any feed ramps or change feed ramp profiles on any CZ, and I'm on my 6th one. That was the whole attraction to me... having a gun that functioned properly on day 1.
> The mags new CZ's come with are Mec-Gar, which are generally rated to be the best in the business. Any change in mags would only be a step down.
The bottom line is this:
If you'll simply go with the ammo recommended in the Preferred Ammo List thread then you'll be OK. Lots of other CZ owners have already shot multiple hundreds of rounds and basically done the testing for you. That's the power of belonging to a Community of CZ lovers. That is why this forum exists. And, that is why that thread exists on this forum.
It's really as simple as that.