Do you use clover or a Brownells or Midway product for your lapping compound..........?
I just use the Brownell's 800-grit compound that came with the lap. I've also made my own "micro lapping compound" out of the 8000-grit aluminum oxide I use with my knife strop, and some light machine oil. But that was just for lapping a couple of parts so they fit together better, not for scope rings.