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"Once sighted in adjustment knobs can be zeroed"..what does this mean?

Discussion in 'Rifle Country' started by dodging230grainers, Oct 14, 2008.

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  1. dodging230grainers

    dodging230grainers Member

    Feb 25, 2005
    Houston, Texas
    According to Leupold on their Mark 4 M1 scopes,
    "Once sighted in adjustment knobs can be zeroed"

    Does this mean that each of the elevation settings can be zeroed, so that I would initially zero the rifle at 100 yards, then go to the "2" elevation setting and zero at 200 yards, then "3" at 300, etc, so that I could just dial the proper elevation number at a given distance instead of making the adjustments every single time?

    Or am I completely wrong?

  2. bullockcm

    bullockcm Member

    Sep 18, 2006
    I am not familiar with that particular scope but in my experience the statement "once sighted in adjustment knobs can be zeroed" usaully means something a little different.

    My take is you sight the rifle in for what ever distance you want. At this point the elevation knobs on the scope are most likely no longer at zero. Now there should be an adjustement to let you set the knobs back to zero without changing where the gun shoots. Now when you want to shoot at a different distance you can use a ballistics table to find how much elevation to add or take away from your zero setting but still easily go back to zero.

    Hopefully that makes sense!
  3. Kharn

    Kharn Member

    Dec 24, 2002
    bullockcm's correct, you can move the turrets independant of adjusting the reticle so that you can set it to read 0 elevation, 0 windage for your favorite load at your selected distance.

    When shooting in different conditions than your zero, you would calculate the change in zero, adjust the scope accordingly and your first shot should be very close to the point of aim. If you reset your turrets to 0/0 for your default range & load, changing your scope back after making the shot is easier than if you had to remember if it was 23/45 or 45/23 as you only have to remember 0/0.

  4. JRadice45

    JRadice45 Member

    Aug 25, 2008
    I'm not familiar with the leupold scopes, but others I have seen with adjustable knobs usually have small allen head screws/detents that hold the knobs in place. Once the zero is achieved you loosen the allen screws, rotate the knob to the 0 position and re-tighten the screws.
  5. texas chase

    texas chase Member

    Sep 19, 2006
    Central Texas
    Thank you for this post!

    I have been searching THR for almost an hour trying to answer this question before finally stumbling on this thread. I'm new to optics and just got a Super Sniper 16x42 for my 7mm Rem Mag. I think this is how this scope works also. Can someone confirm this?

  6. 1911 guy

    1911 guy Member

    May 5, 2005
    Garrettsville, Oh.
    That's it.

    Zero at your chosen range, set mark to zero. Now you can click off a given number of mils for longer range. The trick is to shoot a box drill at 100 yards and see if your scope repeats. To shoot a box drill, zero at 100, click 2 mil left, 2 mil down, 2 mil right, 2 mil up, fire another group. Should land on top of the first group. If not, rezero and forget about it. If it does, set your marks to zero and you will be able to click off and return to zero at will.

    DRYHUMOR Member

    Jul 6, 2008
    The small allen screw(s) on the knobs hold them in place.

    Once the rifle is "zeroed" at 100 or 200 yards, loosen the screws and rotate the knob so that the 0 and indexing line are aligned.

    Your windage and elevation are now set for a given yardage. You rotate the knob a given number of "clicks" to move the impact.

    Once shooting is over simply move the knob back to the 0 indexing point. You are back where you started from.
  8. dmazur

    dmazur Member

    Apr 28, 2007
    Pacific NW
    Point of clarification -

    On some scopes, if you move the knob multiple turns there are additional marks that you have to read for the total MOA adjustment. Sometimes these resemble a torque wrench.

    So, to return to zero, you have to move the knob enough to get all the marks back to the starting point...
  9. MCMXI

    MCMXI Member

    Jul 1, 2008
    NW Montana
    Yes, the Leupold Mark 4 scopes with M1 dials have horizontal hash marks on the elevation turret.

    There's no way to "zero" the vertical hash marks on the elevation turret on an M1 dial .... well, none that I can see .... although the Leupold factory may be able to do it. If you know of a way I'd be interested in hearing about it.

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