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75 Meter Scope Qs

Discussion in 'Anything Airgun Related' started by Neil Dobson, Jan 9, 2020.

  1. Neil Dobson

    Neil Dobson Engaging Member

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    At a range for the first time today , 75mtrs (82 yards ish) with knock downs at 30/40/50 etc.
    Walther RM8,
    jsb heavy 10.34,
    4-16x44 AO Vt1 discovery scope

    To hit the 75mtr target was having to have max up elevation and holdover 4 mil dot with 16x zoom! Is that a problem/issue Am I expecting to much at that range , wrong scope (it has been mounted correctly checked)
    First time at a range so go easy chaps , was good fun and enjoyed it just after some help and guidance on what I should be doing/ expecting with what I have.
    I will be going again next week so any advice will be greatly appreciated.
     
  2. TonyB55

    TonyB55 Engaging Member

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    What range did you zero at? A slight error at 25m can translate to a much larger error at longer range. Run the data through Chairgun and see what it should be. You need to know energy of rifle and all the pellet data.
     
  3. Neil Dobson

    Neil Dobson Engaging Member

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    Zero was at 30m , did not have chrono with me for energy but when checked a couple of weeks ago it was 11.4 FPE with this pellet.
     
  4. Chouchin66

    Chouchin66 Busy Member

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    The only problem I see is this; assuming your muzzle velocity @ +/- 715-720 fps (11+ ft-lbs). Not knowing scope mounting height, turrets maxed out - your erector tube is floating in the scope tube , this will lead to a wandering zero, due to lack of interior spring tension on tube letting reticle free - float. If long range shooting is the norm ... @ this power , go with an adjustable mount /shims @ front ring or dial down to 10x. Floating erector tubes are bad news... Hope all that made sense.
    Cheers.
     
    Neil Dobson likes this.
  5. Neil Dobson

    Neil Dobson Engaging Member

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    On my next visit I think I will re zero and also stick to a shorter distance for a bit, I may well be running before learning to walk!
     
  6. Chouchin66

    Chouchin66 Busy Member

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    At least you're at the track ! Enjoy your rifle & your shooting mate, nothing at all wrong with going big the first time out ... Heck Christopher Columbus did it.
    Cheers

    .
     
  7. Figgy

    Figgy Posting Addict

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    The more you go up your mag range on a second focal plane scope, the less mildots you get to holdover.
    Try less magnification. Zero at what chairgun recommends for a 1" kill zone. Print out the range card and see how it compares to what you have.
    You can calibrate your scope in chairgun too.
     
    Last edited: Jan 9, 2020
    garyjm and cloverleaf like this.
  8. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    FWIW I'd advise you leave the scope's adjustment alone (cheap scopes never track very reliably / linearly / repeatably; especially at the extremes of their adjustment range) and wind the mag down to get more holdover on the aim points :)
     
  9. Keithchief

    Keithchief Engaging Member

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  10. Keithchief

    Keithchief Engaging Member

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    Try reducing your mag to 10x. You can then reduce your elevation adjustment on the scope.
     
  11. Neil Dobson

    Neil Dobson Engaging Member

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    Should I be thinking about a better scope?
     
  12. Shotaholic

    Shotaholic Engaging Member

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    The first question I'd be asking is how much elevation did you have to dial in at your zero range of 30m. It could be the elevation turret already had quite some elevation dialled in and it's simply that the rear of the scope need packing.
     
  13. Neil Dobson

    Neil Dobson Engaging Member

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    Will check that out
     
  14. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Not necessarily.. IMO the vast majority of airgun-targeted scopes are pretty cack when it comes to reliable adjustment and it seems that you have to be spending at least £300 on more firearms-market scopes / brands before they start getting much better.

    FWIW The only scope I'm comfortable dialling with is the Sightron SIII on my centrefire; all the cheaper stuff on the airguns etc gets left for fear of it not doing what I expect it to!
     
    Bunny-on-Bunny and pbrown like this.
  15. Billbill

    Billbill Newbie

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    Try some adjustable mounts but to be honest if your hitting it with what you have and you no the ranges hay your still hitting them no matter what mildot and at what mag I would say wind it down to 10 power
     
  16. pjgtech

    pjgtech Keep Back...!! 2 Metres min...!!

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    70m is a long way for an airgun target! Not impossible, I know some shoot even longer ranges, but you are getting near to the extreme.
    Any slight error, in gun /scope set up, or your shooting technique gets magnified at larger distances, so consistency gets harder at range. As others have said, try slightly lower mag.
    Most airgun shooters IMHO shoot to around 50m. Our range has targets from 21m to 50m, I zero at around 35m which gives me a good trajectory for most of the targets from 21 to 50, roughly 1mildot up or down.
    I'd maybe try consistency at shorter ranges, 25, 30, 35, 40m and slowly shoot further out as you get consistent / better.
    Enjoy your shooting buddy.... :thumb:
     
    Neil Dobson likes this.
  17. Neil Dobson

    Neil Dobson Engaging Member

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    Some great advice , thanks for all the info will give me something to work on next time.
     
  18. jesim1

    jesim1 Kit bitch to the Stars

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    I agree with @pjgtech - your looking at distances beyond what most people would consider realistic with a sub 12fpe air rifle, but people will push it for fun. I generally think 50m is about as far as I'll go, but if my range went further then I'd push it too, but just for fun and just on spinners, it's too far for hunting accurately. Here is an idea from Chair Gun on what your doing - the settings are guestimates based on a 35yd zero and JSB heavies with an 11.5fpe rifle like yours - remember this is yards, meters will be even worse! Your POI at 50 yards is 3 inches under your zero - fine, but at 60 yards it's 6" under, and by 75 yards it's 14" under :rolleyes: Realistically your 75m will be around 18"+ of a drop according to the maths. If you want to do this with your current scope you need to shim the rear of the scope which will effectively raise your POI. Don't go too much though or your closer targets will be hard to zero on, so just a bit at a time till you get it right - I'd try roughly 2mm to start with.

    [​IMG]
     
    Neil Dobson likes this.
  19. Neil Dobson

    Neil Dobson Engaging Member

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    Great stuff very interesting too so thanks for the reply , as for the long distance it was more for fun and to see “if” I could hit something at that distance which I did a few times but agreed in reality I should be concentrating more on shorter ranges but it’s good fun none the less :):thumb:
     
  20. GPConway

    GPConway Engaging Member

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    A different approach using MERO. Maybe something like this:

    Screenshot 2020-01-10 at 08.50.43.png

    Screenshot 2020-01-10 at 08.50.21.png

    Or, using the Android version:

    Screenshot_1578644001.png

    Screenshot_1578644025.png

    I've never used JSB Exact Heavy so I've estimated the BC by simple proportion to the 8.44 Grain item. The Sight Height is a guess too.

    George
     
    Last edited: Jan 10, 2020
    jesim1 likes this.

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