A point to remember is that copper-washed ammo is one thing, brass-cased is another...... and lacquered-steel is MOST definitely another.
The lacquer from the casings can build up inside the chamber and COOK IN. It then GLUES your empties in place. Chemical flushes will not help, much of the time.
Thing needs to be cleaned and the chamber SCRUBBED with extra-Fine steel wool to get that lacquer out.
I got a Hungarian Tokarev that came out of Angola, back in 1980. It has shot a lot of rounds and won a few matches, but it has always been fired with brass-cased or copper-washed ammo: Yugoslavian, Russian, Chinese or handloads.
So far it hasn't jammed, but I suppose anything is possible.
The Tok is as reliable as a ROCK. If it starts jamming, it is likeliest that you are doing something wrong.
Germans used lacquered-steel ammo in the MG-42. (Brass cases were reserved for the Air Force.) Each gun was issued with 4 barrels and barrels were changed-out every 200 rounds and CLEANED. Remember, they LOST.