Re: 338 lapua/nightforce
To answer the question about the 12x42 scope. Yes 45 MOA's will work. Magnification seems to lower the amount of clicks you get out of a scope, not sure why. 45 MOA's is over 450" at 1000 yards. In a prefect world, your gun will zero in the middle leaving you 22 clicks of elevation. If you run into, or think you're going to run into a problem, needing more elevation you could get a canted base.