At what point does magnification come into play. Is there a certain distance where a 3x starts to lose out compared to a 5x. And also why are Mil\Mil scopes mainly 3-3.5x power I am looking to buy a my first high end scope no more Lueys looking at nxs or uso and was wondering if should I should suck it up and spend the extra money on a 5x Premier or S&B.