Here’s how I zero-ed my AK/SKS rifles: http://www.ak-47.net/ak-47/sightingin.php
You can print the target directly from the site.
I have RPK adjustable sights on all my AK rifles, so it’s easier to do the windage than trying to press the drum on the FSB. It is a drop-in replacement, and you simply lose the 300 yd “battle setting”.
The “50/200″ talk depends on your rifle, ammo, and trajectory of the bullet. Some rifles can be set using this method, while others cannot. Use cheap ammo, get cheap results.
Never challenge a man who has nothing left to lose.