Wrangler,
Run a fx3 6x42 or a if you want a variable a vx3 3.5-10x40 will fit the longer action better and is still reasonable with the weight.
Don't have any vx6's so can't offer advice there.
I run a fx2 6x36 on my 270 and have it all the way back with no issues but it' a very personal decision as to how far back you want it.
