A leupold 2.5x20 will do what you want. Mine just about clears the hammer.
I was looking to maximize eye relief on a 16.25" 375 jdj so I had an extra set of holes drilled and tapped to move the base forward. The scope is in low weaver rings on a mgm 6 hole base. I don't think there is a lower combination out there.
Could you post a pic? A leupold 2.5x20 would be a great scope set up like this on a contender