You can get the +/- .05, .10, and .20 inserts for 1" rings.
The 30mm rings only have +/- .10 avaialable.
When I used the .10s in my 30mm set, I gained 19 MOA. That was with DD bases, on a short 700.
With the 1" Zee Signature I gained 36 moa using the .20's fore/aft. That is on a pic style base on a 10/22, with ring spacing of approx 3.5", or 10 slots on the rail.