So had a bad experience with a box of herter's 7.62x39 today. Took the sks out with 2 boxes of herter's ammo. The first box shot pretty normal with the exception of 2 where the empty case went sideways and didnt fully eject. The second box however was anything but normal...2 of the cases split, one down the side and one right on the shoulder; 4 ended up withe pierced primers one of which the primer like seperated from the case itself and 4 of the cases didnt extract at first, the bolt cycled but the shell didnt extract, the bolt stuck and then with a good pull it extracted the spent shells. Anyone else have this problem? I think its the ammo because i've put a couple hundred rounds through it of wolf and some off brand stuff that i got for cheap without so much as a shell not fully ejecting.