Sounds good to me.
I've got a fixed 2x tasco on a .44mag, but feel that's just too low a zoom for a .308.
A 2-6x should work nicely.
The only reason I was considering the fixed 4x was the larger field of view at 100 yards.
The eye relief is also more adjustable on the 4x being 11.8-17.6".
The eye relief on the 2-6x is 16".

I guess as long as I keep the reciept (cabelas) I can return one if it doesn't work out.