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Question About Shooting Air Rifle

Discussion in 'Night Vision Optics and Illumination' started by David_7, Jan 26, 2020.

  1. David_7

    David_7 Newbie

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    Hi everyone, this is my first post so sorry if there are any mistakes.

    I have an AA S510 xtra FAC air rifle with an MTC Optisan (MTC) Viper 3-12x44 IRS optic scope.

    I'm shooting at full power with bisley magnums (have sample AA fields and JSB sample ordered) off a bipod with her zeroed at 40 yards.

    I'm happy with accuracy so I want to start shooting at different distances. So my question really begins here:

    As the MTC Viper is a second focal plane scope (I think it is but correct me if I'm wrong), I know that the mildot hold over/unders for different distances will change depending on the magnification. However if I use the turrets to adjust POI instead of holding over/under, will the number of clicks be the same at different magnifications?

    For example, if I need to holdover say 14 clicks at 12x magnifications, will it still be 14 clicks at 3x magnification and anywhere in between?

    Hope my question is clear and thanks for any replies.

    Thanks David.
     
  2. Shotaholic

    Shotaholic Busy Member

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    Hi David and welcome.

    Using the turrets to adjust for pellet drop means you will be aiming with the crosshair and not the holdover markings so the magnification setting of the scope will be irrelevant. This is of course providing your scope is not defective. Some cheaper scopes (and some more expensive scopes) can suffer from a change of POI as the magnification is changed. It's easy enough to check if yours is OK simply by shooting at a known distance at minimum mag and then shoot the same target gradually increasing the scopes magnification each time. If your scope is Ok the POI will not alter.

    Edit: To answer your question more fully; a pellet will drop by the same amount over a given distance regardless of scope magnification. This means when aiming with the crosshair if the pellet needs 14 clicks to bring it on target at x3 magnification it will need 14 clicks to bring it on target at any magnification setting.
     
    Last edited: Jan 26, 2020
    David_7 likes this.
  3. jesim1

    jesim1 Kit bitch to the Stars

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    Spot on.

    All I will add is that this is true only of the centre of the cross hair if you think about it, as it is always the same, but the cross hairs and marking on them will correspond to different measurements as you seen them on an object as the magnification changes - but the clicks will always be the same for the centre dot, but not the rest of the markings as they (in your perception) expand/shrink ;)

    I think your trying to use two different methods to estimate POI, you would probably be better getting a FFP scope or learning your mil dot drops at various ranges if your wanting to swap around with magnification. Most shooters will use the mag adjustment for spotting and identification, but shoot on one mag so their distances and holdovers are always consistent:thumb:
     
    David_7 likes this.
  4. David_7

    David_7 Newbie

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    Thanks Shotaholic for the great reply. It answers my question. I know my POI is fine for different magnifications so I should have no issues. I will start to get my turret adjustments for different distances this weekend. :)
     
  5. David_7

    David_7 Newbie

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    Thanks jesim1 for your great reply. This also answers my question. I think I will do some target practice to get some turret adjustments for 5 yard increments maybe?

    I hate the way the reticule goes very thin at low mag with FFP scopes but I suppose they are really designed to be shot at longer ranges where the low mag is pretty much useless!

    Only shooting at one magnification for mildot drops is a good idea which I never thought of, and will definitely use from now on with my SFP's.
     
  6. Popgun

    Popgun Donator

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    imho for sub 12 air rifle distances you only need low mag scopes
    this fellow makes a lot of sense


     
  7. Russ Douglas

    Russ Douglas YouTube: RussDouglas222

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    It can depend really, you want low enough mag / wide enough field of view (FOV) to look around and not miss spotting adjacent / closer targets -plus notice what the breeze is doing to intermediate grass etc too.

    But I also want high enough mag to hit that pound coin-sized head shot kill zone with confidence.

    Furthest recentish non-FAC shot I remember on a bunny was @42m, seated with my rifle rested on trigger sticks. Scope on 12x, slight breeze in my face and it just toppled without a twitch, very nice end to a paddock stakeout session that.
    Cheers. Russ
     

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