I've used various combos but settled on a M8 4X for a true light weight. 4X will get you further than you think. 2nd option is a SWFA 3-9HD on a more do it all rifle with possible longer shots. I have 2 on a pair of Tikkas. With Sportsmatch rings, they still are under 8 lbs all up and a very solid set up.
It took a while but I have 'seen the light' as to hunting hard conditions with most variables...
