scope unlevel (cant)

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Cassman, Oct 20, 2019.


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  1. Cassman

    Cassman Member

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    I mounted a scope on my gun, don't have a high dollar level, just normal level from hardware store,,put gun in vice got it level, mounted scope got it level...go sight it in 100yards...dead on bullet in bullet,,,,
    go to 300 yard target,, shoots 3 inches to the right...let friend shoot,,,make sure its not me,,,same place 3 inches right,,,,so I been reading and I believe that my scope and gun are not perfectly level to each other....scope cant its called... so which way do I need to move my scope if im standing at the butt of gun(stock) looking at scope....left or right?
     
  2. DENWA

    DENWA Well-Known Member

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    3" at 300 yds would be a bit of cant.
    I would recommend you take a 4 foot level at 100Yds and put your rifle in a vice.

    see if the cross hairs align with the level.
    If they are straight then I'd look a load stability, as I have seen this before with factory ammo
     
    skipglo likes this.
  3. Deputy819

    Deputy819 Well-Known Member LRH Team Member

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    Did you make sure the reticle was “plumb” after leveling the rifle?
     
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  4. ShtrRdy

    ShtrRdy Well-Known Member

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    3" at 300 yds seems like a lot of impact shift due to cant. Could there be wind anywhere along the path of the bullet that could have pushed it?
     
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  5. Cassman

    Cassman Member

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    it looked level when I looked thru scope...but apparently it was not...
     
  6. Cassman

    Cassman Member

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    just a slight wind
     
  7. DUSTY NOGGIN

    DUSTY NOGGIN Well-Known Member

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    3" at 300 .. you would be able to tell with just your eyes

    it may be off a little .. but it also must be something else
     
  8. DUSTY NOGGIN

    DUSTY NOGGIN Well-Known Member

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    if its dead on center at 100 .. your scope must be sitting on the rifle to the left of centerline .. in order to cross the path at 100 .. still moving to the right

    both of those problems i think you would be able to see without use of any tools
     
  9. Hatrick

    Hatrick Well-Known Member

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    Hang a 1/2” white rope at 100 and level your rifle and check plum on the weighted rope.
     
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  10. Bigeclipse

    Bigeclipse Well-Known Member

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    this x2.
     
  11. Bravo 4

    Bravo 4 Well-Known Member

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    If it were just wind, it would take around 10 mph full value to blow it off 1 moa (with most bullets at reasonable speeds). That shouldn't go unnoticed.
     
  12. BountyHunter

    BountyHunter Well-Known Member

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    To check at 100 it is called the tall target test and pretty easy to do. It also allows you to check the exact distance each click really is on your scope vs what the mftr says it is. They are routinely off and you dial the wrong elevation and think something is wrong with your data, no the scope clicks are not what they say. Just google tall target test.
     
    Last edited: Oct 22, 2019
  13. ShtrRdy

    ShtrRdy Well-Known Member

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    For my .308 Win it only takes 5 mph full value wind to move it off 3" at 300 yards. ( according to my ballistic program )