I have experimented with CZ52s, Tokarevs, and a Turkish Mauser I converted to 7.62x25mm with a Remington 30-06 take off barrel and cut down breech.
I have put a Parker Hale sniper bull barrel 308 on a Tokarev, making a very long barrel scoped handgun.
I bought 10 more CZ52 barrels and combined them with my other CZ52 barrels and in 2005 had the RC hardness tested with results were that hardness varied from RC25 to RC47. That would correspond in almost a 2:1 range in strength.
I have experimented with 85 gr, 86 gr, and 110 gr jacketed bullets.
I have experimented with H110, AA#9, Ramshot [same results as AA#9], LIL'GUN, N105, XMP5744, LONGSHOT, AA#5, and Power Pistol.
I have experimented with S&B brass and with Starline brass.
I have played with factory ammo Czech surplus, Polish surplus, and New factory S&B.
I have blown up CZ52s.
I have exchanged correspondence with load book publishers and a gun magazine author about errors in their writings on this topic.
What have I learned?
1) The Tokarev is best and strongest [never mind what 10 year old load books say]
2) Power Pistol is the best.
3) 110 gr jacketed is the best.
4) S&B is the best.
5) Those who write books or a magazine say the same thing when I point out it differs from my calculations and tests "We were just writing what we had read somewhere else."
6) I would not use and any AA load data circa 2000 in a CZ52.