Krochus:  Well, he sure does overload but his analysis of variations in the CZ-52 strengths and his analysis of barrel lug area failures is correct.
He isn't so nuts about rechambering a 9mm or 7.62x25mm for the 9x23mm.  Yers ago I ordered a 38 Super barrel for my Tok and will shoot factory power level loads in that caliber if I want to shoot heavier bullets.  And yes, the 38 Super and the 9x23 case can both handle 158 gn bullets.  Just for giggles I also got a 9mm barrel for my Tok but neither the 9mm or the 38 Super shoot to the poa the sights are regulated for so whenever I drop the Tok into a holster it is most often in the original 7.62x25mm caliber.  
BTW, a lot of 38 Super shooters use the 9x23 brass as it eliminates feeding problems with the small rim of the 38 Super some pistols experience.  HTH.  Mikey.