Leupold again and again and again
But I did Purchase a Shepherd 618 V1a for my new 300wsm and at this time it is doing exactly what they claim I am impressed check them out the system is working to 800 yards for me at this time and I think the quality of the optics although not as good as Leupold are quite good a little less clarity but the one shot zero concept is bang on just google Shepherd scopes and check it out!
Leupold is the sure thing, safe and conventional but Shepherd is neat and time will tell.