I've got a Pecar 3-7x35mm in Optilock Extra Low mounts on my Sako AV 9,3x62mm... German no 4 reticle.

Even though it has a steel tube, it is still quite light and doesn't make the whole rig feel unbalanced. Very happy with it, bought it nearly new just before Pecar closed their doors.

I generally carry it around on 3x (I have a thing about seeing the front sight with 1.5x scopes!) but can crank it up for longer shots if required.