Your ammo is too long.
FIrst of all, can you move the slide back far enough to line up the field strip marks? If you can then pull out the slide lock and strip off the top end. Remove the barrel and knock the round out using a wood dowel from the muzzle end. This is by far the ideal way to correct your error.
If it went FULLY into battery I'd suggest carefully lower the hammer and take it to the range and discharge it. I know it's against the rules and laws but it would be the best way to avoid damage to the gun at this point.
Otherwise you're going to have to slam the slide open
With the gun pointed in a SAFE direction, since it's loaded with a live round, grab the slide very tightly with a full finger overhand grip. You may want to use a leather glove to aid with the grip. With your other hand come forward from some distance back and really slap the back of the grip frame HARD. Ideally grab the grips at the same time in the hopes of not throwing the gun ahead. It may take a try or two but it should pull the round out of the jam.
If you have a vise on a bench where you can pad the slide with some heavy card stock and clamp the gun upside down you can do the same thing more easily since the vice jaws will hold the slide better than your hand. Just use care and some heavy card stock similar to a cereal box to protect the finish. And since it's pointed horizontally be sure where it's pointed and that it's safe.
Alternately figure out a way to clamp the slide so that the barrel is pointed into something safe and do the grip slap. A 5 gallon bucket of sand is good for something like this.
Note that this slap extraction is VERY hard on the extractor hook. So go out of your way follow mlhetovarra's advise and chamber check it in the bare barrel to size the length. This is also why I suggested making the gun safe as you can by lowering the hammer IF IT IS FULLY IN BATTERY and just shoot it out at the range.
CZ ammo needs to be loaded to around 1.10 or even a hair less. It all depends on the shape of the bullet. I had some "fat" 147's stick lightly even at 1.10. I had to get down to around 1.08 as I recall.
Best of luck with whichever method you go with. Just don't compound one error with another. Treat that thing like the loaded gun it is and be darn careful with any procedure you use.
