Copied both posts from a different forum....this forum is where I'll go for my CZ from now on.
Update: A day later, shot 150 rounds of Fiocchi 147 gr and then 50 rounds of Blazer Alum 115 gr. Not one problem with those 200 rounds. Then, I tried the MagTech 115 gr again, and out of 30 shots had 6 failures to extract. Ironically, for me, the MagTech was the most accurate (by a small margin) of the three.
MagTech does seem to shoot softer. I suppose for now that is the issue. Lighter recoil spring perhaps to shoot "softer" loads?