You probably have a cheaper set of rings that are too loose for your scope. You have several choices, You can replace the rings with a quality set, you can use a flat file to take a little off the under side of the flat area where the screws go (carefully and only a little at a time, this is best left to someone who has experience) you can "shim" the rings with anything from cheap black tape to fine emory cloth by taking a wrap around the scope where the rings fit, but keep it narrower than the rings so it doesn't look like a cheapo junky job. You can also add some powdered rozin to the ring area which I found really works well. Then, tighten the screw back down after you put some blue locktight (blue is not permanent, red is and can't be removed if used) and check for level, eye relief, and tightness. Be aware of "scope eye" on a loose scope. This is where the loose scope slides back in recoil and cuts a large circle around the shooters eye. It hurts like heck, looks terrible and bleeds like mad. I watched a guy get it from a 7mm mag and he laid his forehead open to the bone.
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