Hello and welcome! Well, I'll be honest in saying that my longest kill big game so far has been only about 350 yards... so take my advice with a grain of salt
6br seems to be a good site, knowledgeable guys. It seems to have a more bench rest crowd there (would make sense). I don't have much experience w/ savage forum however.
As far as your optics goes, it seems to be a general consensus to turn the turrets rather than relying on expensive custom reticles for extended ranges. a custom ret will be good for one atmospheric condition and one load alone. Now with the ready availability of good ballistic calculators it is easy to make your own drop charts for different loads or conditions.
You can have a very very good custom rifle built for a lot less than that gun werks rifle. I'd go w/ AJ's advice here too.
good luck, Mark