I had good success with the Ivey ring set up in the past. I would put roughly 50 moa in the rings, then use the scope to run farther out. 50 moa put the rifle at 1,760 yards. I eventually sold the rings, as I switched to a lower magnification scope, which allowed for more internal elevation adjustment. I typically shoot in the 16x area when punching paper at 1,760.
If I were to go back to the adjustable ring/base set up, I would most definitely experiment with the MOAB base. It was not on the market at the time I used the Ivey rings.