A friend won a Vanguard in 270WSM and wants me to pick out a scope and mount it for him.. I chose a Leupold VX3 4.5-14X40mm ... I'd like to use the Burris Signature Zee rings but I am having trouble finding the bases.. Are all Weatherby's bolt patterns the same? Also the rings are offered in Med or High... I'm assuming Med will fit the 40mm Obj.. correct?