I think it's Bulgarian there was a lot of that ammo manufactured in most Soviet Bloc nations. Here's a site that specializes in the cartridge and shows examples. Click on the country and see if you can track yours down.
It kind of sounds like you are trying to determine if there is propellent in the cartridge. Did you or someone else reload some cartridges and maybe forget to add powder or are you concerned maybe there's too much? If that's the case, the safest thing to do is pull the bullet and weigh the powder if you can identify what type was used. Otherwise discard the powder and reload using correct type/weight.