Originally Posted by Hired Gun
Either system will get the scope centered. The Burris inserts are good for up to 40 MOA correction and can do elevation and windage depending on how they are orientated. I like them and use them on everything that isn't getting a pic rail or Talley Lightweights. They are structurally superior to the windage adjustable bases. They do have a place though because they will fix the worst possible misalignment.
Before you go milling/drilling new holes to line things up have the action checked out and see if those scope holes are really out of line with the bolt raceway. Your barrel can easily have this much curve or be threaded crooked. I see factory barrels very crooked when we dial them in for brakes. The last thing you want to do is try plugging and redrilling. That is the very last ditch salvage maneuver.
That's what I was going to suggest.
I have a Model 70 that HAS to run windage adjustable bases, the holes are aligned perfectly, but the barrel is on crooked, it has in excess of 45MoA to the left of centre from the true bolt axis. I was lucky that the windage adjustable bases allowed this much adjustment.
To check the hole alignment, I ran mine in a mill fixture, the crooked barrel was obvious, even without a depth guage running along it!