I'm building a 260 remington. My current setup on the rifle has a viper pst scope with a non sloped tps base. The scope maxes out at 45 moa of elevation ajustment (up). Total for scope (up/down) is 65. I want to shoot 1200 yards with 140 amax bullets. Will this setup be sufficient to do so? Scope is currently zeroed for a 308 at 100 yards. Would use 100 yd zero on 260. This is assuming the 260 zero will be within a few moa of what the 308 is currently at.