Ok I was looking for some help here and I am very new to all of this, I have just got my scope back from Leupold with new M1 knobs, and I am mounting it with Burris signature rings with the 20 inserts. can someone walk me through what would be best for zeroing in at 100 or 200yds and how to get this thing setup back to zerodo you losen that little screw? , also what is the best way to make a drop chart, I'm not sure how this click stuff works? Sorry about all the stupid questions just never tried this before. THANKS!