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Thread: Chrony string

  1. #1
    Inactive Member

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    Default Chrony string

    Hiya

    I've just done a chrony string on my S400 Carbine, would like to know if I should perhaps limit the fill.
    I filled to 200 Bar on the bottle gauge, which equates to 190 Bar on the rifles guage.

    Pellets were unlubed and unsorted AA Fields 4.52. I don't have a scale so I can't be sure of the differences in weights.
    The rifle had a new breech o-ring fitted as the older one had flats worn into it. Didn't bother cleaning the barrel though.

    1. 782 (190 Bar on rifle)
    2. 780
    3. 784
    4. 784
    5. 784
    6. 782
    7. 783
    8. 785
    9. 785
    10. 784 (180 Bar on rifle)
    11. 784
    12. 789
    13. 787 (175 Bar on rifle)
    14. 788
    15. 789
    16. 788
    17. 790
    18. 788
    19. 791
    20. 789
    21. 789
    22. 791
    23. 793
    24. 790
    25. 790
    26. 790
    27. 789
    28. 793
    29. 789
    30. 793
    31. 792
    32. 793
    33. 793
    34. 793
    35. 793
    36. 792 (150 Bar on rifle)
    37. 792
    38. 794
    39. 793
    40. 793
    41. 790
    42. 793
    43. 789
    44. 793
    45. 790
    46. 790
    47. 790
    48. 793
    49. 792
    50. 792
    51. 791 (140 Bar on rifle)
    52. 785
    53. 785
    54. 787
    55. 787
    56. 787
    57. 786
    58. 783
    59. 784
    60. 781 (125 Bar on rifle)


    Appears to be a swing of + - 6 fps over the 60 shots. Was wondering if perhaps should limit the fill to 180 and stick to 50 shots.

    What you think?

    ...

  2. #2
    Sharp Shooter

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    That is called CONSISTANT. Don't change a winning formula!

  3. #3
    Inactive Member

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    With a spread like that, I won't worry about it.

  4. #4
    Marksman
    The Guru

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    looks perfect

  5. #5
    Inactive Member

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    That my friend, is what an AA S400 is all about. Nothing can beat it seeing as it is an unregulated system using 65bar to put out 60 shots with a variance of as little as 6Ft/sec at around 12Ft/lb. Most regulated race guns cannot even duplicate that at more than double the cost. Viva Air Arms Viva!!! :rocker

  6. #6
    Inactive Member

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    Thanks for the input guys. So it looks like it's just down to the plonker behind the trigger eh? :flush

    It's alot better now, seeing as I can get 60 'acceptable shots' (used to be 42) - just the fps spread has remained the same.

    Guess I gotta learn to only pull the trigger when the crosshairs are over the kill zone. Oh dear - sounds hard. :twak

    ...

  7. #7
    Inactive Member

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    First things first, Why do you say it is better "now"? What changed?

    Second things second. Yes, the general idea is to SQUEEZE the trigger just as the target shakes into line with the cross hairs. In my experience that is usually when the target falls over or a nice round hole appears in the middle of the target, depending what you shoot at.
    I am being told, on authority, that most of the modern rifles (PCP) can do that ad-nauseum. It is the plinker that stops it from happening every time. Apparently, even Weirauch shots have achieved, on occasion, to knock targets over. :toocool

  8. #8
    Sharp Shooter
    The Professor

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    Hi Avion,

    Very good results on the chrono.

    You realise though, the downside of publishing those results is that you have now removed a very useful excuse from the "reasons why I missed that target" file. :rotflmao

  9. #9
    Sharp Shooter
    Protea FT Team '08

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    Dale , Avion has been shooting well lately.

    Avion I still cant believe how fantasticly well your gun performs

  10. #10
    Inactive Member

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    Hehe - Dale, in all honesty I've never blamed my rifle for a missed shot. I used to blame my el-cheapo scope, but I can't even do that anymore since I got the Lynx. :;pat

    I'll blame it on my low sugar levels from now on. Now if I could just stop smoking I'm sure that'll help too.

    Gerrief: I found some German grease in the trigger unit, I replaced it with British grease - now my shot count has increased!
    Honestly though, I'm not going to say what I did. It was an accident, lucky the rifle is behaving better for it though.

    I used to only get a +- 3 fps swing, but only 42 shots, the 43'rd and onwards was dropping by about 15 fps each shot.
    So now I've got a slightly larger swing (which was worrying initially) but a far larger shot count. (approx 20% increase)


    ...
    <span class='smallblacktext'>[ Edited Tue Feb 14 2006, 07:26PM ]</span>

  11. #11
    Sharp Shooter
    Protea FT Team '08

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    That sort of accident needs to take place in my gun.

  12. #12
    Sharp Shooter
    The Professor

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    Hi Avion,

    No offence meant with my humour , I have heard over the years all manner of things (and said a few such things in the past) about missing.

    Seriously though in respect of your results they are excellent with an extreme spread of 12fps over the 60 shots - you would find most regulated rifles would not do any better.

    If you wish to increase the no. of shots, the best way would be to fit a Classic cylinder with Xtra-FAC barrel bracket and a muzzle brake of some description, as this would give you extra air volume to work with.

    Dale

  13. #13
    Inactive Member

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    Hiya Dale

    Nah mate, I know you only taking the piss.

    Hmm nice idea that, wonder how much a Classic's cylinder is.


    Anyone have a clue?

    ...

  14. #14
    Inactive Member

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    hey avion,

    i got my carbine done as described by Dale.........def. more shots, yet to test but i reckon 20-30. with the muzzle brake/air stripper fitted......the balance is spot on to.

  15. #15
    Sharp Shooter
    The Professor

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    Try Hennie at Target Specialists or Louis at AA, should not be very expensive though.

    When modified can look like this:

    Deadlinkskig_menu/_imagefiles/s400ka_resized.jpg[/img]

    Makes a nice little package with good balance and about 25% more shots. Down side is you cannot easily fit a silencer, but if your using the rifle for FT that isn't too a problem.

    Dale

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