I found this ballistic turent tape while reading a post on http://www.longrangehunting.com, most scopes do not have a zero stop feature and very few have programmable elevation turents. I installed this tape system on two of my long range varmint/target rifles and found them to be very effective for quick elevation adjustments all while not losing any of the multiple zeros at different ranges.
http://customturretsystems.com/
I added a unique feature to my custom label. A simple Asterisk at the point blank range indicates where to dial to for consistent hits on game with a pre-determined impact zone out to the max effective range. (more on point blank range later)
http://www.longrangehunting.com/articles/custom-turret-systems-review-1.php
knowyourzero 