I recently bought a 308 and put a Leupold 3.5x10 on it . I shot it out to 600 yds on a target and was surprised at how well the aim area stood out ( about 9 inch square) putting three shots in it. While up to 15 to 18 power is better you will end up with a heavier scope.
I believe the HD models help a lot giving better clarity.
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