You are a idiot for shooting Patrone 'S' out of your rifle, expecially when warned about it. All the rumours surrounding Turkish 8mm ammo exist because people don't understand that it is at a different pressure and will destroy guns not designed for that pressure.
I have heard it called 'machine gun ammo', and rumours that the powder 'degraded' over the years increasing the velocity, well the reality is it is just a different earlier loading for that cartridge. Firearms have been destroyed by that ammo due to the pressure curve and the actions not being designed for it. Specifically I have personally seen examples of FN-49s and Hakims that were destroyed by it.
What you are doing is reckless and irresponsible, all to save a couple bucks. I hope the firearms and you aren't harmed by it, but there is a good chance you will be. As much as you may try, you can't fix stupid.