Took my sks to the range & put 100rds through it. I noticed a casing blew its primer out. I used Winchester & American Eagle. Both brands blew primers out. 1 of each brand looks like the firing pin may be going too deep into primer. Any experienced info is much appreciated. Here's some pics, I hope it helps. Winchester on top, AE on bottom.
30.1 KB Views: 324
27 KB Views: 241