As the stickies will tell you, CLEAN THE RIFLE THOROUGHLY BEFORE USE!
Clean the rifle thoroughly after using corrosive ammunition (surplus military)
Make sure your firing pin is free moving and not stuck forward (will cause slam-fires)
Chrome lined bores will hold up better than non-chrome with regards to using corrosive, but still CLEAN YOUR RIFLE. non-chrome will have slightly better accuracy, but I would recommend chrome, this is an SKS after all, it's not that accurate anyway.
Edit: I feel I should edit and mention that accuracy comment is in regards to sub MOA groups, not that it won't hit the broad side of a barn haha