This doesn't exactly answer your question, but I had to share this story about Ruger scope rings:
I got my first Ruger early spring of this year.  I mounted the rings on the action and put my pointy, alignment dowels in to check the alignment before installing the scope.  To my horror, one ring was about 1/4" higher than the other.  "I can't lap that kind of misalignment out" I thought.  I read through the owner's manual (always a last resort) to see if I'd done anything wrong.  The manual was at best, vague and gave no indication I'd done anything improperly.  Steamed at Ruger, I got on their website to find a phone number or address to contact and let them know they'd screwed up and sent me mismatched rings.  While perusing their website I found some illustration stating that the higher ring should be mounted towards the front (or was it the back?).  Humbled by this new information, I returned to the basement (my place of refuge in our home) and switched the rings around.  They were perfectly aligned.  After a quick lapping, I installed the scope and boresighted.  Sure wish they had included that info about different height scope rings in the manual!