I purchased equipment without thinking about this. I have not had time to mount the scopes and mounts to the rifle and go out and shoot it. It is all brand new. Scope 5-25x56 S&B PMII and 5-20x50 Ultra Short PMII. ERA-TAC 20moa mounts. The mounts are NIB. The mount for the big S&B scope, is built to sit as low as possible, with the PMII. The mount for the illuminated Ultra Short sits higher. Of course, if it is all but useless, I can sell the mounts and purchase the same mounts without the elevation. Can you zero with a .338 LM and .308/6.5 Cred and not bottom out with the 20moa rail and mounts ?