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am i right about this scope eureka moment! ha ha

Discussion in 'Anything Airgun Related' started by macker71165, Jan 5, 2014.

  1. macker71165

    macker71165 Donator

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    yesterday i was zeroing my scope at 10 yards and was getting nice groupings on my target! then as a experiment i tried a laser bore sight (£10 of e,bay) to see if it worked? i screwed it into my barrel switched it on and aimed the red dot at the target it was just on the centre of my crosshair! then interesting i kept looking thru my scope as i scanned my surroundings and noticed if i looked at things very near to me my red dot would drop to the mildots below! and the same if i looked at things further away it would rise to the mildots above! now i gather this is what people called hold under/over! but only been shooting a few months never quite understood what it meant! if this is correct what a great idea for beginners like myself to use a bore sight as a learning tool and experience this without taking shots! and seeing a visual representation of it using a laser dot! am i right in thinking i am correct in thinking thats what was happening? atb tony!
     
  2. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    You got it, sort of!

    If you are looking at shooting things further away you will need to lift the barrel up. When you do that the red dot falls down your reticle to the centre point! That is hold over (as in hold over the zero point)!

    If they are closer you need to lower the barrel so that the red dot rises to get to the centre point. That is hold under (as in hold under the zero point).

    So remember further away lift, closer to you drop!

    I don't know if I would recommend your method, the good old cardboard box filled with newspaper and a big X on the side worked for me!
     
    Last edited: Jan 5, 2014
  3. Wild Bill

    Wild Bill Long time poster

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    Many hunters use lazers attached to the scope for this exact reason. It is an aid to rangefinding also.
     
  4. macker71165

    macker71165 Donator

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    cheers guys!:up:
     
  5. Jackroadkill

    Jackroadkill Donator

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    Here's a rough idea of where the pellet goes when it leaves the barrel. As you see it rises to the close (secondary) zero, keeps rising until it reaches the upper limit of it's trajectory and then begins to fall. At the point of the further (primary) zero it is at the same height as the primary.

    [​IMG]
    If the shot is made at either very short or (relatively) long ranges the shooter will have to use holdover because the pellet will be below the crosshair; at medium ranges the shooter will have to use holdunder to account for the pellet being higher in relation to the crosshair.

    Practise will teach you how much holdover or holdunder you need, but Chairgun can help you learn.
     
  6. terry1001

    terry1001 Major Poster

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    That's a good illustration of what happens, just remember the laser gives a dead straight line as an extension of the bore and the pellet flies in a parabolic curve. What you can do is use the laser as an aid for fitting a new scope or checking that your existing one hasn't been knocked off zero without needing to shoot. First it's worth checking that the laser is concentric, that is to say fitted exactly in line with its fixings. To do this clamp the rifle up in a vise of some sort and put the laser in the muzzle. Make a mark on the top so that you know how its been fitted, when you have done this turn the laser on and aiming at a target about 40 yards away gently turn the laser in the bore. The red dot should stay on the same point, if it rotates in a circle then it is not exactly right. This doesn't matter too much as now that you have a mark on it you can always put it in the bore the same way up. When you're happy with this you can set the scope either to max or min zoom (this will always be the same every time you go to it as at different zooms the mil dots will be at different holdovers - check in Chairgun) and aim at a target at a known distance. You can then see where the red dot coincides with the scope reticle when correctly zeroed. If you check every now and again you can see if your scope has gone off zero and if you fit a new scope you know where it should roughly be pointing.
     

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