In following the links in the "SF Police seize cannon" piece below, I found this embarrassing video illustrating how NOT to load an SKS rifle.
Now that will get you killed in a serious social situation. SKS rifles, of course, are designed to be loaded with stripper clips, as below:
Of course if you don't have a stripper clip (and if you are serious about your defensive rifle you will have plenty), you can still load rounds singly through the top with the bolt pulled to the rear. It takes a real genius to make things this complicated, but, there you are.
It is not a bad idea to read the manual on a rifle before you try to load it.