My son has a new Tikka T3X in 6.5 CM that we're putting on a Swarovski Z5 3.5 x 18 x 44 with a one-inch tube. We already have the scope. The scope has 58 MOA max elevation travel. I'm trying to decide between a 0 MOA or 20 MOA scope base. We mostly hunt Coues Whitetail deer in Arizona. I usually have zero at 200 yards. Our max shot in a hunting situation won't be past 600yards. We'd like to target practice out beyond that though. We'll be using Hornady 143 grain ELDX rounds. Any thoughts or suggestions you care to share??