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it's probably not too much magnification for that range, but you may find yourself running into some issues with mirage at that magnification, depending on where you live and when you like to shoot during the day.
For targets under 600 yards I would go no more than 12x due to the small exit pupil, in both 16x and 20x, for shooting late afternoon/evening conditions.
Exit pupil: 12x = 3.5mm, 16x = 2.6mm, 20x = 2.1mm