Hi, I have a question for anyone who has used the Burris xtr signature rings. I'm going to sight in my 10 stealth this weekend and I have a set on my vortex hts. There isn't much info on sighting in with them. I have the -20 insert up front with 0 in back. Do I hope that my first group is high so that I can dial down to it thus opening up more up moa adjustments? Should I only worry about shimming the rear left or right towards impact if it's 5-20 inches or 3 inches or more like the instructions say? There are not many videos on YouTube actually doing a sight in. Thanks in advance.