Scope Come ups and REPEATABILITY

Discussion in 'Long Range Scopes and Other Optics' started by HeskethPritchard, Aug 24, 2007.

  1. HeskethPritchard

    HeskethPritchard Well-Known Member

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    Guys I am hearing and reading alot about a scopes need for repeatability when dialing in your adjustments and then returning to the zero'd position. Whilst I understand the need for such precision I was wondering:

    Are there scopes out there that are recognised as being excellent in this area and I need not worry? I own S&B and NF scopes are these ok?

    As you know in the UK firearms ownership is tough and range time is even harder to find; for example my club pays out over $400+ for rental of a range for half a day (4 hours) and they are usually running comps during this so for me to complete ladder tests and scope tests just aint gonna happen in the near future.

    Thanks
     
  2. BountyHunter

    BountyHunter Writers Guild

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    It is normally the comeups not the go downs. you might find that if you come up and stop at the exact spot the first shot will be off from where it should be. You then are tempted to add some more and then you find on the second shot you are way over.

    What has happened in laymans terms is that the spring tension going up does not release like it should and the erector tube stops short of the correct spot with the reticle. You fire the shot and all of sudden the recoil jars the tension loose and the reticle moves to the clicks it should have been, but your shot was low so you add more clicks and are now over on the next shot. Now this normally does not happen every time which drives you crazy. Testing may or may not show it with one test.

    There is a simple preventative measure that will stop with IF you suspect it or just want to prevent it. Go 5 clicks PAST your intended stopping point and then come back down to the intended stopping point. coming down puts tension on the movement and normally ensures that they reticle is stopped where it should be.

    BH
     

  3. Mysticplayer

    Mysticplayer Writers Guild

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    solutions

    Not perfect but here are two ways to test your scope without going to the range.

    You can use a boresighter set plumb to your reticle. Adjust the turrents and see how it tracks against the grid inside the boresighter.

    Second, use a lazer bore sighter. Unit has a bore plug that you put into the muzzle with a laser pointer at the other end. You bore site by shining the laser on your wall. Shine the laser on a piece of lined paper and see how the reticle moves relative to your laser point. Grid paper would be ideal.

    Clamp the rifle down so that it cannot move at all.

    Not perfect but will show major tracking problems. Final test should be done with shooting.

    Jerry
     
  4. Ridge Runner

    Ridge Runner Well-Known Member

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    get some graph paper with 1/4" squares on it set it up at 100 yrds and run the crosshairs around on it, checking for accuracy (vice the rifle) of movement, I use a 4x8 sheet of OSB (the ones marked in 16" icrements) at 500 yds.
    RR
     
  5. Chrismadrid

    Chrismadrid Well-Known Member

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    Never had NF but from reputation - They're fine. S&B are from reputation and personal experience exemplary. You're safe - fret ye not!
     
  6. HeskethPritchard

    HeskethPritchard Well-Known Member

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    Thanks guys
     
  7. blygy

    blygy Well-Known Member

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    How about IORs specifically the 3-18X42. Are these repeatable???? and properly calibrated???

    Thanks
     
  8. jwp475

    jwp475 Well-Known Member

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    I own Nightforce and they are calibrated in Minutes Of Angle not Inches Per Hundred Yards and they are precise....I can highly recomend Nightforce Scopes for being repeatable and very reliable........[​IMG]
     
    Last edited: Aug 31, 2007
  9. jwp475

    jwp475 Well-Known Member

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    Nightforce Scope are also extremely rugged as the scope in the picture will attest.. The 3.5X15X50 has an Ak-47 bullet hole completely through the tube and still functioned perfectly..The Solder taped up the holes and used the scope for 3 more days as it still adjusted properly and held zero....[​IMG]




    [​IMG]
     
  10. Chrismadrid

    Chrismadrid Well-Known Member

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    IOR's are my choice where I cannot justify an S&B. I have a 3-18*42SFP and it's excellent. Repeatable. It's correct at 10mag.

    Also have a 3-18*42FFP sat at the Post Office for collection Monday.
     
  11. Chrismadrid

    Chrismadrid Well-Known Member

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    Interesting - like to see other shots of the guts. Bullet missed all glass.
     
  12. jwp475

    jwp475 Well-Known Member

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    Yes the bullet missed all glass,but went through the errector tube..... I looked through this scope at the 06 shot show in Vegas......