Strange 9mm brass

Jeff,

I surmise that the strange primer reaction is due to what the case was shot in (ie. an AR upper).  The photo of the inside of the cases is interesting.  It appears that the Ruskies solved  the problem of the bullet being pushed back into the case by making a shelf for the bullet base to sit on.  I assume they could be re-loadable, if one took the very reduced case capacity into account.  The other possibility is the cases are for "marking" or paint ball type ammo for use in a service weapon.  Again the shelf is used to keep the paint pellet from being force back into the case as it is driven into the chamber from the magazine of a service weapon.  Our local Sheriff dept. uses something similar.