Like I said, the Ruger stainless medium rings (that came with my gun) were too low for the (new) Nikon ProStaff 3-9 X 40. I had to use the set of Leupold high (Ruger) rings to clear the barrel. I had a similar issue mounting my other new ProStaff scope on my Remington 700. I had to buy high (Weaver Grand Slam) rings for that also. The medium Grand Slam rings claimed to work to 44mm scopes. The bell cleared but the bolt handle hit the rear part of the scope. So the scope you use will make a difference.
