Spent the other day shooting and ran into one problem with my SKS which I had never fired before. It shot flawlessly but I had a problem with loading it. I could not use the stripper clips to load the mag. When I pressed down it seemed like the rounds seemed to bind up. I pressed as hard as i could and they wouldnt budge. I ended up loading it a round at a time directly into the mag. Can anyone tell me what the problem is and how to remedy it?