If you ever load 9mm for a CZ, you'll find CZs chambers are tight and short. Apparently your chamber is as well.
When you seat a test round, do yourself a favor; completely ignore the manual's OAL listing There is an OAL range for every bullet in every chamber that is defined by the fatness of the bullet's ogive and the tightness and shortness of that chamber; no way the testers who publish the load data can try every possible bullet/chamber combination.
Assuming the brass is properly sized, seat the bullet, flatten the flare (if you flared, which you most likely had to for lead bullets) and keep nudging the bullet in deeper until it passes the plunk test. Now, will the round also go into your magazine without hanging up? If so, and if the bullets are consistent, that's your OAL for that bullet in that barrel/chamber. (Ogive can vary from batch to batch and even bullet to bullet in the same batch.You might find that a whole bunch seated to this depth pass the plunk test, and then one just doesn't--that's normal with bullets made to a more generous tolerance.)
Fat stubby bullets (e.g., many LRNs and JHPs) have to be seated more deeply to pass the plunk test in some chambers--that's just the way it is. So, you will want to carefully examine your powder charge as well, starting a bit lower for bullets that are more deeply seated. But also bear in mind that sometimes a fat bullet is also somewhat shorter base to tip, so seating it deeper doesn't necessarily result in smaller than usual case volume.
It's a lot to deal with, is it not? But deal with it you must.