I have 5 TT-33's (and clones) and 3 CZ-52's and have been shooting them for around 12 years and I have thousands of rounds of two distinctly different 7.62X25 loads and 2 Broken TT-33 recoil Springs to prove it. I'll agree with you that the Sub-Machine Gun ammo isn't hotter, in fact its the other way around, the Czech produced M48 rounds have a velocity(85 grain FMJ bullet @ 1,640 ft/s) around 18% higher than that of the actual velocity of the Soviet/Russian Sub Machine Gun ammo(which they claim is 1600 ft/s but its not) or you could go one step lighter if you can find it and put the "30 mauser" (7.63x25) in there, its WAY underpowered. The PPSH's were VERY Cheaply made and I don't know that I would want to shoot Czech TOK ammo in one of them, especially a late war PPsh. What I was referring to was the crap they put on and around the primers that tends to junk up around the hammer and trigger assembly and adds to the already difficult issue of the hard primers. Add to that the fact that one or two dry fires and your pin is shot, which, the return spring will take care of that. Regardless of what you hear on this thread, replace your pins, I learned the hard way after I broke my first pin, I bought a 2 surplus replacement and an armorers kit before I found out about the hardened aftermarket Pins.
"Call on God, But Row Away From the Rocks" -Hunter S. Thompson
Freedom is something that dies unless it's used -HST
"In a nation ruled by swine, all pigs are upwardly mobileand the rest of us are F###ed until we can put our acts together: not necessarily to win, but mainly to keep from losing completely. We owe that to ourselves and our crippled self-image as something better than a nation of panicked sheep."-HST