I saw a tape that is on a spool that retracts attches to scope to help set windage and elivation. what is this? I see people use tape with adjustment information attached to the stock. I need a good range finder too! Oh I got me a woodchuck this saterday 400yards..it took some time for it to keep its head above the soybeans at first I thought I missed but I found him his head was gone. Good coyote food.