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Scope bottomed out

Discussion in 'Rifle Discussion' started by Oakley1wa, Aug 30, 2011.

  1. Oakley1wa

    Oakley1wa Beaverton, Oregon, United States Member

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    Hey everyone!

    I need a little help. I have an FN Patrol Bolt Rifle with a Nikon Buckmaster scope in high quality, quick release rings and I cant zero. I took it out to zero and was about 6 inches over my target at 100 meters with my scope fully adjusted down. I'm very frustrated

    Any ideas on what to do? Or a shop that could help?

    Thanks!
     
  2. Scott

    Scott Battle Ground Well-Known Member

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    Take it off and put it back to its mechanical zero. If you don't know what that is and I am not suggesting so but take the windage and elevation and turn them all the way to the end but don't force when you come to the end. Then count the clicks all the way back to the other end and divide by 2 and turn it back that many turns on both. That way the reticule is dead center in the scope.

    Then remount and bore sight and hit the range again. I think the Buckmaster series has 40 or 50 MOA availble adjustments so you should not be bottoming out.

    If that does not work make sure you are mounting it right as well.

    But first set the mechanical zero and that is the best way too start. You have plenty of adjustment available.

    That should work.
     
  3. ron

    ron Vancouver, Washington Silver Supporter Silver Supporter

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    Too High? Put a shim on the bottom side of the rear ring. A pop can is about the correct thickness. You might need more than one.
     
  4. civilian75

    civilian75 Hillsboro, OR Well-Known Member

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    Hmm. There is no mention of a laser or optical bore sighter or any attempt to zero before heading to the range. I'd do exactly what Scott said, plus, you should try to debug your problem at our garage before you head back to the range. If you do not have a bore sighter, you can still do a rough adjustment, to get on paper, just using your Mark 1 Eyeball. This is how it is done:
    1. set up a very bright target at approx 25 yds.
    2. set your rifle on a cleaning stand and remove the bolt.
    3. while looking down the bore from the bolt side, align the rifle to point at the target you set up at ~25yds. This could be tricky; you might find it easier to move the target to align with the bore, and that's ok.
    4. adjust your scopes zero.
    Good luck.
     
  5. Oakley1wa

    Oakley1wa Beaverton, Oregon, United States Member

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    They are Thompson quick release rings on a factory installed riser, that does have a built in taper. What really confuses me is when I put in the laser boresighter and have the scope at factory center, it looks right. It sits about two mil-dots high. I then adjust to the boresighter and my shots are not even close.
     
  6. Grommit327

    Grommit327 Buckley Active Member

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    Turning the turret the wrong way? Sorry couldn't resist ;)
     
  7. civilian75

    civilian75 Hillsboro, OR Well-Known Member

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    Did you try checking zero with your bore sighter AFTER firing the rifle to check it the scope shifted position? Albeit unlikely, your quick release rings may be messing with you.

    Also, what's the distance between bore and scope center line (should be between 1.5 to 2.0"), at what distance are you setting the point blank zero (should be between 25 to 40 yds, closer if the scope is higher) and what's the muzzle velocity of your ammo? For example, assuming 1.5" scope height and shooting r 150gr FMJ NATO fodder at ~ 2800 fps, point bank zero is 30yd for a 200yd zero, at just 2" high at 100yd.

    But, regardless, your scope's elevation dial should not max out. Did you save the target? If you did, I'd be willing to help you debug this issue if you can come to my house. I am available Friday after 3pm-ish. Also bring your bore sighter.
     
  8. Chugger

    Chugger Central Oregon Member

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    I had a similar issue with a scope on an sks that I had a Choat scope mount placed on it. I failed to get it completely level with the bore and I did not have the room to complete adjust the elevation. A fellow on another forum recomended Burris Signature Rings. With these rings, you can purchase a spacer set that allows nearly unlimited adjustment for your optics. I cannot speak highly enough about how well these work.

    The link above takes you to Burris' site and there is video about how these are used. I strongly reccomend these for your troubles.
     
  9. rickoshay

    rickoshay gaston or Member

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    Old scopes don't a lot of adjustment my be you need a new one
     
  10. Gunner3456

    Gunner3456 Salem Well-Known Member

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    Uh, wouldn't this make it shoot even higher? What's wrong with my brain, LOL?