According to the real big bore boys ,those who actualy do shoot there realy big gbores ,the leupold 2.5x compact is the toughest thing around on a big kicker. Also from what Ive heard ,the scopes with the bigger objectives are inherentley weaker due to the bigger ,heavier glass having more momentum to move and stop. I love Zeiss scopes on my smaller rifles and binoculars but have heard that they are not as strong or reliable on the big kickers ,but optics are the best.