I use the same rings and scope on my Featherweight.
I started with the "O" inserts and boresighted, close enough and got zero after very few shots.
The point of the inserts is to correct gross misalignment without using the scope adjustments. This is benefical if you are concerned with over adjustment affecting scope peformance and/or available range of in-field point of impact adjustment (with the turrets).
Probably more benefical to serious long range applications, seeing as these scopes are not really designed for that (no AO or ballistic turret) you are probably like me and using them for a quality no fuss point and shoot system.
Start with the zero inserts and unless you have major issues I wouldnt bother with the others.
Burris video.
https://youtu.be/wcRAX5OLtJE