This video provides the necessary information for choosing scope rings of the proper height. Larry Potterfield, CEO and Founder of MidwayUSA, explains why proper ring height is important and how to determine the height you need using a variety of scopes and scope rings.
When determining how high of a ring you need to order, there are a couple of factors that need to be taken into account. First is the objective bell diameter of your rifle scope. It is vital that the objective bell and the barrel do not contact once the scope is mounted. Second is the bolt handle's ability to clear the eyepiece. While many suggest that you choose the lowest rings available that meet this criteria, it is also important to remember that when shouldering the rifle you should have the scope naturally come into position. If you have to "cheat" your face placement on the stock, then the scope is either too low or too high. Choose the ring height that allows you to naturally sight through the scope.