I have around a dozen sets on rimfires through slug guns. Love 'em. I wipe some kroil on the inside of the matte metal rings prior to seating the inserts for an ounce of corrosion protection. I also use kroil on the ring screws, purple or blue loctite on the bases. I use Burris' suggested torque settings and have had no problems. No ringmarks.
I never had to tighten them to the point that there was no space between the rings though, as sakoluvr described he had to do.....odd
Last edited by 7025Jack; 10/27/12.