Thanks for the response. 1) I used the Arken Halo Rings. 2) I installed the bases first. Positioned the scope with proper eye relief. Then places and tightened down the upper rings. 3) I leveled with bubble levels. No feeler gauges. 4) I boresighted it at 50 yards and the reticle is high and to the right both beyond the number of clicks available. 5) It is a Ruger Precision rifle bolt action in 308. I've installed other scopes and never had to make more than minor adjustments to get it zero'd. Thanks for your help!

Thanks for the response. 1) I used the Arken Halo Rings. 2) I installed the bases first. Positioned the scope with proper eye relief. Then places and tightened down the upper rings. 3) I leveled with bubble levels. No feeler gauges. 4) I boresighted it at 50 yards and the reticle is high and to the right both beyond the number of clicks available. 5) It is a Ruger Precision rifle bolt action in 308. I've installed other scopes and never had to make more than minor adjustments to get it zero'd. Thanks for your help!