Those primers look very flat, and the fact that so many of them were blown completely out tells me that your probably past safe headspace. I would definitly take it to a gunsmith and have the headspace checked. The surplus military ammo will have harder primers and they are probably swaged in like american military primers. That will help hold them in, but that is still a sign of high chamber pressures and could cause major safety issues. I would never shoot a gun that was blowing primers like that until I had tracked down the reason for it with absolute certainty. That gun could hurt a shooter or bystander, please get it fixed before you shoot it again.
Scheme well, scheme often.
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