I used to be able to light matches at 100 yards with my Knight MK85 setup. A couple of years ago, I bought a NE Arms Ultra Slug gun and was astonished at the accuracy with Lightfield slugs.

Then about 2 years ago, everything changed - my groups at 100 yards are all over the map. The only difference was I put new Warne scope rings on both firearms that have the torx head screws. Both have rather expensive Redfield Illuminator scopes. Because I can really tighten the torx screws down, I'm wondering if it's possible to get them too tight on the scope tubes and cause some negative affects on consistancy? Thanks.