The CZ-52 is not as strong as the TT-33. The barrel was thinned out for one of the rollers, which is it's mmajor weak point. You can fire regular 7.62x25 through it all day, but please do not try to hotrod the round.
From a post at the Firing Line:
CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assume any liability for any damage or injury resulting from use of this information.
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B) The questioning of the "CZ52 is stronger than the Tokarev" myth on
the internet
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2000
1) I blew up 2 CZ52 pistols that split the barrels and took pictures.
http://www.thehighroad.org/attachmen...7&d=1059258212
2) Ken Marsh, long time rec.guns contributor, pointed out that the crack
propagation seemed to start from a think spot in the chamber chamber
where there was undercutting for space for the roller blocks.
2003
1) Jaque Clarke "Uncle Jaque", a CZ52 owner, makes a drawing of this
thin spot. Here is the drawing:
http://www.thehighroad.org/attachmen...47360&d=116269...
2) I am unable to blow up any of my Tokarev pistols, with what blows up
CZ52s and much more.
3) I buy a broom handle 1896 Mauser 30 Mauser to compare to CZ52
strength. It blows primers, but does not blow up at the loads that blow
up CZ52s. I cannot go higher with these primers.
2005:
1) John Becrovitz, long time rec.guns contributor, buys 10 CZ52 barrels
and tests them for hardness. Measurements between RC25 and RC35 were
taken on intact 7.62x25mm barrels. A more modern 9mm CZ52 barrel tests
at RC47.
2) Accurate Arms "revised" their hot loads for the CZ52 only. This
example is for 110 gr SPR RN 1.3":
a) The hot load from 2000: 11.7 gr AA#9 41,800 c.u.p 1688 fps
b) The wimpy load from 2005 8.5 gr AA#9, 34270 psi, 1248 fps
http://www.accuratepowder.com
click on "30 (7.62)"
click on "7.62x25 Tokarev"
"Lynn,
As a result of various technical reasons, the data in the initial print
(year 2000) of the no 2 guide were not tested against a verifiable
standard or protocol.
As a result wrong conclusions and assumptions were made. The result was
that the initial loads were too high.
The recent adjustments were made in two phase’s i.e.
a) A Reduction in velocity to conform to the correct barrel length since
the initial velocities was for a 9” test barrel.
b) The adjustment of the actual charge weights to conform to the only
Specification/protocol in existence i.e. CIP “Commission International
Permanente” which is the authority, since this caliber does come from
Europe.
This pressure limit is : <2400bar or 34809Psi.
The final loads as published on the website are thus inline with these
standards.
However, due to the strong design of the CZ 52 pistol, people have been
using ex submachine gun(i.e. PPsh-41) ammunition from the eastern bloc,
which obviously were loaded to a much higher levels, and some of these
will function in the CZ 52 pistol. However, there is ammunition that
will even destroy the CZ 52.
Although the CZ52 gun can handle much higher pressures than some other
weapons it has never been incorporated into an official specification.
The strength of this gun is renowned, which lead to many “estimations”
of performance and a reputation of being able to handle just about
anything out there on the market.
This is obviously not true and we deemed it necessary to conform to the
official International specifications for the cartridge.
Regards
Johan Loubser
Ballistic Lab manager
Accurate Powders"
What does it all mean?
I have never got any published source to recant in print the myth about CZ52 strength, but the current published loads for CZ52s, Tokarevs, and broomhandles is now below that of original factory ammo for CZ52s, Tokarevs, or broomhandles. The loads are now lower than the lowest common denominator. Admit no errors, but lower the loads was the reaction.