There is a reason long range and tacticals are heavy as slim pointed out. My current tactical, (.260) weighs in a little over 11 lbs and some would consider that light.
however the 11 lwh in .260 should be a small enough caliber to work well on a 5.5 lb rifle that when scoped and full mag will be closer to 7 lbs most likely.

To me it's just a matter of, is it worth $700+ to gain that extra 8ozs of weight savings over what i have now. blue