Yes, CZ advised the steel case ammo will cause premature damage as Si Vis already advised.....
CZ REPLY READS...
We cannot recommend the use of steel cased ammunition in our pistols, as the steel to steel contact will cause excessive wear to contacted parts such as the barrel, slide, and extractor.
This will require much faster replacement of these parts so while in the short term the cost is slightly cheaper for the ammunition, the later replacement of these parts or even pistol would outweigh any savings.
For this reason, we can only recommend quality factory brass cased ammunition for the best function and longevity.
Thank you,
Randal Stroud
Technical Support/Gunsmith Rifle Lead