A few htings to make sure of:
1- Ruger rings come as matched sets, so do not mix and match them, and make sure they are assembled the same way they came apart.
2-Remove the large nut from the scope ring crossbolt, clean the threads with alcohol or GunScrubber, then put a dot of blue threadlocker on the screw threads and reassemble.
3- Put the large bolt head on the off side of the rifle, so you don't bark your knuckles when trying to reload real fast sometime. Tighten the bolt fairly tight, but don't try to break it.
4- Clean the scope ring screws and screw holes with alcohol or GunScrubber, put a dot of blue thread locker on the screws, and a dot of threadlocker in the bottom of the rings.
5- Lay the scope in the rings, place the scope ring tops over the scope, insert the screws but do not tighten yet.
6- Align the scope crosshairs and set the proper eye relief for you. Tighten the scope ring screws gradually and evenly, tightening one side, then the other about one turn at a time. If you tighten one side completely before tightening the other side, you will torque the scope in that direction, and you will have a large gap between top and bottom halfs of the rings on one side.
7- Once the screws are tight, go back and check screw tightness again, wipe off any excess threadlocker, and let it sit for a few hours.
8- Go shooting. Repeat often.