This ammo if its BXN marked 51-53 on stripper clips is made for chez sub guns. Its loaded with 86 grain projectile that has steel core penetrator. I chronied it and out of my chinese tok bullets fly out at 1750-1780 fps. Much hotter than what normal loading for 7.62x25 should be. Chez ammo was usually loaded hotter than other com block countries due to different firearms that they designed for themselves like cz 52 for example that took full advantage of hotter ammo.
If you have trouble with this ammo, sell it as is, don't do anything to it. If you clean the lacker off which will expose bare metal case, then it will stick and expand even more in the barrel as you fire it.
Get some different ammo for your pistols like new copper washed ammo that Tradex has, it should solve your issue.