I use Leupold standards on almost all of my 700s.
I also bought a roll of very thin lead tape from McMaster-Carr years ago. With an exacto knife I cut a tiny little sliver of lead tape and mount it in my rings. Actually I use two slivers front and back top and bottom of each ring.
An older gunsmith friend of mine told me about lead string years ago and this is the best I have been able to find or use.
In my opinion it really helps.
