How to determine Size of Scope Rings needed?

Discussion in 'Equipment Discussions' started by Silversbullet, Mar 10, 2011.

  1. Silversbullet

    Silversbullet Member

    Mar 8, 2011
    What size of scope rings do you think are best?
    Shorter the better?
    Or 1" high rings?

    And why??
  2. Hntbambi

    Hntbambi Well-Known Member

    Sep 26, 2008
    It all depends on your application. There are a few measurements that need to be taken. Here are some in no particular order:

    The scope's objective bell outside diameter (no not 40mm or 50mm, the outside diameter including the housing) if you use flip ups add the thickness of the also

    The scope's tube diameter (1" or 30mm)

    The height of the mount

    With these numbers you can figure out how high of a ring you will need to allow the objective to clear the barrel.

    Brownell's has a good chart on this
    How to Determine the Ring Height You Need

    They also have a video using clay to determine ring + mount height:
    Determining Scope Ring Height

    The top chart does not take into account hammers, charging bars, or other mechanical devices that may require a higher than usual scope mount/ring combo. Some receivers are too short or the scope needs to be set further forward in which case an offset ring is needed.
  3. 7mm Magnum

    7mm Magnum Well-Known Member

    Jan 29, 2009
    The closer you can have your scope mounted to the barrel the better,.. just be sure it won't interfear with things like round ejection, or the throw travel of the bolt handle (if bolt action), etc.

    I have a 56mm objective on my 7 mag and the bell of the objective lens set's about 3/16 of an inch above the barrel right over the area that the old iron sights used to be. ( had to remove them from the barrel on my 700 BDL)
  4. sp6x6

    sp6x6 Well-Known Member

    Dec 8, 2009
    Len posted a video in that sect. on scope fit
  5. Len Backus

    Len Backus Administrator Staff Member

    May 2, 2001
    This is a very helpful source.