elkhuntingguide if you haven't already read it take a look at "Rifle Accuracy Facts" by Harold Vaughn. In Chapter 5 (page 93)he details a test of the mounts that showed 1/2 MOA of lateral movement on target. Test basically consisted of tapping the front mount one direction and the rear mount the opposite direction using a small hammer and a wooden dowel. Haven't tried it myself yet but will sometime. Something to think about anyhow.
