[jjk308 In Memoriam RIP]

The .30 mauser should be interchageable in the PPsh41. I'm assuming the Soviets were smart enough to make it to function with captured German and Finn ammo.
The Finns bought millions of rounds of .30 mauser from Germany in WWII, to use in SMGs designed for the Tok round.
So its interchangeable in some guns, or one way only, .30 Mauser, or 7.63x25 Mauser can be used in a 7.62x25 firearm, but not vice versa. I hope anyone with a nice broomhandle or Luger is savvy enough to know this, unlike the Guns writer.

 

[jjk308 In Memoriam RIP]

"in the beginning the 7,62 Tok was only a soviet made 7,63 Mauser loaded hotter than before"

"The Russian loading of a cartridge that is basically a 7.63mm Mauser round, is more potent"

Where did you guys get this info? Common wisdom, internet myth, actual documentation?

The Mauser C96 was a popular alternative to the Nagant revolver in the Czarist and early Red Army. In 1929 The Red Army started work on a domestic pistol that was specified, initially, to be chambered for the 7.63×25mm Mauser. They chose a development of the Mauser round, the Model 1930 7.62 mm pistol cartridge, with almost the exact dimensions of the 7.63×25mm Mauser but substantially more power, and chambered the Tokarev pistols and subsequent SMGs for it.

 

[jjk308 In Memoriam RIP]

FSTC-CW-07-02-66, Small Arms Ammunition Identification Guide, page 45 lists "Fig 37. 7.62 x 25 Common names: .30 Mauser pistol, 7.62-mm Type P, 7.62-mm Type 50, & 7.63-mm Mauser pistol" as all being the same cartridge.

https://www.revolvy.com/main/index.php?s=7.62×25mm Tokarev

Although dimensionally similar to the Mauser cartridge, so much so that both cartridges will chamber, load and fire in any of these weapons, the Soviets increased the power of the Tokarev cartridge powder charge significantly. As such, while the lower-power Mauser rounds can be safely used in any of these weapons, the Tokarev cartridge should only be used in weapons which were designed for the added pressure.
According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7.62×25mm Tokarev case can handle up to 250.00 MPa (36,259 psi) P piezo pressure. In C.I.P. regulated countries every handgun cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 7.62×25mm Tokarev chambered arms in C.I.P. regulated countries are currently (2017) proof tested at 325.00 MPa (47,137 psi) PE piezo pressure......

The pistol-fired bullet has various muzzle velocities around the range of 1300 to 1800 fps. A common velocity would be around 442 metres per second (1,450 ft/s) with about 544 joules (401 ft⋅lbf) of energy. Given the wide disparity in ammunition manufactured in many different nations, ammunition will be encountered that yields higher and lower velocity. Some newly manufactured ammunition intended for commercial use has a velocity of approximately 1,560 feet per second (480 m/s). Wolf Gold FMJ tops out at 1,720 feet per second (520 m/s) with 570 foot-pounds force (770 J) as does PPU ammunition. Some of this ammunition, such as the Wolf Gold and Sellier & Bellot, uses boxer primed brass cases that are reloadable.


Here's the current CIP pressure specs for the 2 cartridges http://www.cip-bobp.org/homologation/en/tdcc_public?page=1&cartridge_type_id=4

Name............................ Date ...........Revised ......Country ...........Ptmax .........PE

7,62 x 25 Tokarev...... 1990-04-14......2006-09-19...USSR ..............2500 ........3250

7,63 Mauser ..............1984-06-14......2006-09-19...Germany.......... 2250 .......2925

Ptmax is max average pressure, PE is proof, both in bar

My AA loading manual says Fiocchi 7.63 Mauser tested at 27,000 CUP in their test barrel.

Also, when the CZ-52, supposedly a 7.62 Tok designed pistol, was first imported into the USA I read of some blowing up from using ammunition from a lot of ammo loaded for a Sov block SMG.

 

[jjk308 In Memoriam RIP]

https://www.revolvy.com/main/index.php?s=7.62×25mm Tokarev
--- snip ---
Here's the current CIP pressure specs for the 2 cartridges http://www.cip-bobp.org/homologation/en/tdcc_public?page=1&cartridge_type_id=4

Name............................ Date ...........Revised ......Country ...........Ptmax .........PE

7,62 x 25 Tokarev...... 1990-04-14......2006-09-19...USSR ..............2500 ........3250

7,63 Mauser ..............1984-06-14......2006-09-19...Germany.......... 2250 .......2925

--- snip ---QUOTE]

No sir, that is not correct. Here is a scan of the relevant page from the C.I.P. manufacturing standards:

That's a 1990 revision. I posted the 2006 revision right from the current CIP website.