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Scopes Canted scope

Discussion in 'Anything Airgun Related' started by tomsteebs, May 18, 2014.

  1. tomsteebs

    tomsteebs Donator

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    Quick question really, does it matter if your scope is canted?

    As I do it by eye and by how my head fits the stock and then adjust till it looks level with my head position.
    But when someone else uses it they said it was "wonky" but is it best to make it less comfortable for you or to have it canted but in a natural orientation for you.

    Surely the pellet drops vertically so as long as your holding the scope reticle vertically then it doesn't matter?
     
  2. Jimthebrewer

    Jimthebrewer Engaging Member

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    How can a circular tube be uncomfortable for you in any position, it's the same right around. If your grouping with it consistently then it works for you...it's only if your adjusting your shots for windage and elevation that the scope being canted can be an issue.
     
  3. tomsteebs

    tomsteebs Donator

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    Because you have to orientate your head to adjust for the rotation of the scope... So your cheek will be different on the rest.

    I shoot at different ranges so I use more than the centre zero.

    So what I'm saying is as long as you hold the rifle so the scopes axis are horizontal or vertical then really it shouldn't matter If it's canted?
     
  4. 177

    177 Donator

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    Yes, it makes a difference.

    If your vertical is out of whack due to a canted scope your mil dots don't directly correspond to vertical drop since they are also off to one side or the other (depending ono which way the scope is canted).

    This becomes more of a problems the further away your target and corresponding aim point is.

    Aligning a scope is a pain.

    I usually put the gun on a pair of lead shot filled shooting bags and then use a spirit level to check the gun itself it vertically level.

    I then use a plumb line downrange to align the vertical posts of the scope and make sure it doesn't move when clamping the mounts down. Usually I use two allen keys in opposite mount bolts and turn the simultaneously which seems to minimise scope movement when tightening the mounts.

    Of course, once you have a correctly aligned scope, the trick then is to find a shooting style that keeps the gun and scope vertically aligned when shooting...

    :rolleyes:

    Bu the short answer is that, yes, a misaligned scope becomes inherently less accurate either at very close or longer ranges, with only one 'sweet spot' at its zero point, so it's worth putting the effort into fettling your rig.

    Long range full bore shooters go to great lengths to ensure that their rig is correctly aligned and that they are holding the rig correctly aligned for this very reason.
     
  5. tomsteebs

    tomsteebs Donator

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    Thanks, i understand this, but surely if your holding the scope horizontal/vertically correct then the pellet will drop down the reticle post?
     
  6. timmytree

    timmytree Pro Poster

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    Hi Tom, if you don't get the axis of the scope and the barrel lined up correctly you will get crossover at any range other than your zero range.
    Imagine turning the scope clockwise a bit, now if you eye up through the scope the rifle will be canted to the left with the barrel being slightly to right of centre. The pellet will still hit at your zero but closer shots will be to the right, longer shots will go left.
    If you have that problem it is possible to rectify it just by turning the scope slightly but a better way is to set the gun in a cradle and level with a spirit level, then hang a plumb line 20 odd yards away to use as a reference point for the vertical line of the reticule, turn the scope so with the gun level the reticle covers the string of the plumb line, nip up the scope and away you go!
    Regards
    Tim

    177 beat me to it!
     
    Last edited: May 18, 2014
  7. tomsteebs

    tomsteebs Donator

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    Aah okay now I can get my head round it, because I was thinking if your zeroed then surely the pellets drop from the centre directly down with gravity.

    But i didn't take into consideration the gap between the scope and barrel. This is what causes it due to the barrel not rotating around with it. If the gap between the scope a2nd barrel wasnt there then you'd Not have a problem.

    If that makes sense.
     
    Last edited: May 18, 2014
  8. 177

    177 Donator

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    No, if you have a misaligned scope and you hold it vertically then that means the gun is out of alignment to the vertical.

    Example:

    Gun vertical + scope canted.

    Hold that rig with the gun vertical and the scope will be out to the side past zero range.

    Hold the same rig with the scope vertical and you had to cant the gun to get the scope aligned, forcing the gun out of alignment.

    Apologies for the crude diagram:

    [​IMG]

    Either way, your gun or scope will be out of the corresponding vertical plane when on target, which is why the scope has to be vertically aligned to the gun. If you look at where the barrel is in relation to your aim points, that's where anomalies will creep in since only the gun or the scope will be correctly aligned when on target, but you need both for accurate shooting at different distances.
     
    Last edited: May 18, 2014
  9. Largerider

    Largerider Posting Addict

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    It's probable fine at your zero range, but you'll find POI will move off to one side as range increases.

    Have a look at this animation. it'll show you the affect of cant, you will be canting the rifle to make the reticle vertical.

    http://www.arld1.com/images/swfs/impactpointvscantangle.swf
     
  10. tomsteebs

    tomsteebs Donator

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    Cheers animation isn't working on my phone atm.

    So am I right in saying I could zero the rifle on a perfectly verticle line target. And then if I lower my zero all the way and then fire it should hit that line again aswell as the reticle line to be mounted properly?
     

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