Freewheeling - here's some background info for you:
Every rifled barrel has to start the rifling SOMEWHERE just past the end of the chamber. Start it REAL CLOSE to the end of the chamber and the firearm will often be mo' accurate than it might have otherwise been. Start it a ways past the end of the chamber, and the firearm will be more pressure-tolerant than it might otherwise have been. There is no universal standard for this - it's a design spec that each manufacturer sets for their own purposes. It is usually considered ideal to have the bullet just touching the rifling (but not pressed into it) when the breech is closed. By the way - the gap between the end of the chamber and the beginning of the rifling is called 'freebore' or 'leade'.
Now, picture a standard 124gr hardball bullet, and then picture the offending CorBon bullet. The CorBon bullet has a much different profile than does the 124gr hardball, doesn't it? THAT is your problem - the CorBon (and some other newer HP designs) simply use a bullet shape and cartridge OAL that
in sum is so far removed from the 'traditional' hardball specs that, if you wind up on the short end of normal production tolerances, your freebore dimension will be too short. The result is that your pistol will start to engrave the rifling on the slug as the round is chambered.
There are three solutions to this; live with it and continue to use CorBon, don't use CorBon anymore and use a round that works mo' better in your CZ, or avail yourself of CZ's excellent customer service and let them increase the freebore slightly.
By the way - this is incorrect terminology:
Looks like I may have to ship the gun (Or possibly just the barrel?) to have it reamed, or perhaps they could just send a replacement barrel that's reamed with a slightly longer chamber. The additional length that's required is probably between 1/32nd and 1/64th inch. It's not much.
The CHAMBER is not too short - the freebore is. If the CHAMBER was too short, you'd not be able to seat a round and place the pistol into battery. The chamber is the part of the barrel that encases the brass cartidge, and is dimensionally quite standardized.