I'm looking for a scope with ballistic turret to mount on my 300 WSM. I bought the gun for elk hunting and will be using it this year for plains game in Africa. It's my go to for anything bigger than deer. I've narrowed it town to two options - Swarovski Z3 4-12x50 or Z5 3.5-18x44 I'm a magnification junkie and shoot a 50x on my 6mm BR. What range would be better for big game out to 5-600 yards? As another benefit, I think I can use lower mounts with the Z5. I'm just trying to gauge the value of the extra 6X vs. the extra $500 Thanks!