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Thread: reticle-bore alignment

  1. #1
    dog chaser distant stalker's Avatar
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    reticle-bore alignment

    I was testing my scope alignment by drawing a plumb line on the target . winding up 10 moa and checking the bullets landed in line with the drawn line. the end result was a 4 degree shift left with the 10 moa adjustment. I like to make measured adjustment rather than twist and 're-check etc so I looked at the value of 4 degrees from the center to outside edge of the scope tube. seems that the formula for a one inch scope is .2mm rotation per degree (it's not exactly .2 but it would be unrealistic to deal with numbers smaller than this). just if anybody was interested
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  2. #2
    ebf
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    Interesting, how the hell are you going to measure 0.2 mm ! Only way I can think of is exacto knife marks on tape ?

    I was using the forum lapping kit earlier today, and quite impressed with the levels that come with the kit. Did the reticle by eye first, and the tested using the levels, surprisingly small turn required to get a big gap on the two levels to align...

  3. #3
    Almost literate. veitnamcam's Avatar
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    I alluded to this on another thread a while back,Norways?
    where scope is deliberately canted to suit natural hold etc, while Im sure its a negligible error(in most cases) I dont recall if I got an answer to weather he allows for it.

    I set up my scopes buy removing the mag sitting on the bench on the mag well and lining up cross hairs with a anally plum steel post in my yard. Figuring this could be off due to machining errors I checked this with precision levels across the top of the action,top of bottom half of rings and box test. All tests had same result of course as I own a Sako
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  4. #4
    Almost literate. veitnamcam's Avatar
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    The more shit between the scope and action the more POTENTIAL error here, not saying it will but rails qd mounts etc have the POTENTIAL to move scope off centerline which is actually an entirely different issue to cant.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  5. #5
    dog chaser distant stalker's Avatar
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    my bad should have said cant. mine is 4 degrees out so .8mm if it's within 1 degree I reckon that is pretty good. number of ways to measure rotation. will be playing with it tomorrow but wanted an idea of movement required before starting

  6. #6
    ebf
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    k, be interested to hear how you measured it and results...

  7. #7
    dog chaser distant stalker's Avatar
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    with tikkas having a flat top you can just use a flat bar sitting on top of action with one edge pressing against flat piece on bottom of scope. did this with other two scopes and got it perfect. will post pics when I can bring myself to going through the photobucket debacle

  8. #8
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by horihunter View Post
    with tikkas having a flat top you can just use a flat bar sitting on top of action with one edge pressing against flat piece on bottom of scope. did this with other two scopes and got it perfect. will post pics when I can bring myself to going through the photobucket debacle
    Assuming it is actually milled central and square to the bore.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  9. #9
    ebf
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    Quote Originally Posted by veitnamcam View Post
    Assuming it is actually milled central and square to the bore.
    yup, thats the built-in error with the scope "levels" as well, assumes the top of your scope reticle cap is level to the reticle...

  10. #10
    dog chaser distant stalker's Avatar
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    Quote Originally Posted by veitnamcam View Post
    Assuming it is actually milled central and square to the bore.
    always check after but been spot on with other two. if not you just rotate .2mm per degree...
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  11. #11
    R93
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    reticle-bore alignment

    I level my action, then use a laser level to align the vert hair. Check with spirit levels on the scope caps and so far, on all scopes I have done, sweet.
    Even worked on my shitty old March.
    Another method is feeler gauges but can't be bothered explaining how.



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  12. #12
    Member Pop Shot's Avatar
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    Quote Originally Posted by R93 View Post
    I level my action, then use a laser level to align the vert hair. Check with spirit levels on the scope caps and so far, on all scopes I have done, sweet.
    That's how I've done it in past and I've never had a problem.

    Horihunter - any update on that ''CDS design'' upgrade you were toying with for the Superslams....?

  13. #13
    dog chaser distant stalker's Avatar
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    Quote Originally Posted by Pop Shot View Post
    That's how I've done it in past and I've never had a problem.

    Horihunter - any update on that ''CDS design'' upgrade you were toying with for the Superslams....?
    easy enough to do but a hassle if changing loads...
    I'll 're-do the ones for my 7mm mag and show you. the other issue is you need to deal in true ballistic range rather than required moa for the given shot angle on the day

  14. #14
    Lovin Facebook for hunters kiwijames's Avatar
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    reticle-bore alignment

    Skite
    Last edited by jakewire; 09-01-2013 at 12:29 PM.
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    The Universe is a cruel, uncaring void. The key to being happy isn't a search for meaning. It's to just keep yourself busy with unimportant nonsense, and eventually, you'll be dead. -Mr Peanutbutter

  15. #15
    dog chaser distant stalker's Avatar
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    Quote Originally Posted by kiwijames View Post
    Skite
    +1

 

 

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