Well, I mounted a Viper Pst 6-24x50, and XTR med. rings, EGW 20moa base on my 12fv .308 26" bbl 1:10 (165 smk) I could'nt get it to zero at 100 yds. The scope was bottomed out on elevation and still shooting 8.5" high. I have a set of Burris 2pc XTB bases and a EGW 0-moa base coming;any thoughts on how I lost 65+moa?