Great thought...I have wondered about it for along time...But its not feasible, in the least. The CZ83 in Makarov is the hottest round the gun will handle with its blowback design. Thats what the makarov round was designed for ...the most energy/pressure allowable with the blowback design. BUMMER....
To get more pressure out of it, you either change it to a locked breech or ALOT bigger slide to handle the pressure and timing needed. Either way ...it wouldnt be the same.
I even concieved the thought of a delayed blowback CZ 83.....to handle a little more pressure.....might work, but what to do and how much more pressure will it handle.
Great Idea.......wished it could be done.
Shoot well