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I see guys with pic related on top of their hunting rifles walking around shooting ranges like they're going to shoot the moon. It's not just ugly. It's unnecessary. A magnification factor of about 6.5 is all that is needed for shooting animals out to 150 yards. If your quarry is further than that, there is no reason why you shouldn't be able to get closer. Trying to shoot further than that will only make your sight picture shaky. The human eye can only use an exit pupil of about 5 mm--7 mm at the most. What that means is that a 6.5 power scope will not benefit from having an objective lens bigger than 33 mm or 42 mm at the very most.
