I am in the process of building a 6.5X284 for mule deer and elk. This gun will be used for medium range work The farthest would be 700 to 800 yards. My question is if I go with the vortex viper pst..... would I be better off with the 4-16x50 or should I go with the 6-26x50. Which would you go with and why? I was thinking the 4x16 may be better because it will probably be plenty of magnification at 800 and the lower power should be better for light and close shots if they present themselves.